Overview of Balisong Knives – What Is a Knife Balisong?
A knife balisong, commonly known as a butterfly knife, is a folding pocket knife that originated in the Philippines in the early 1900s. The design is distinctive: the blade is concealed within two split handles that rotate around the tang. When opened, the handles swing outward in a motion that resembles butterfly wings — giving rise to its popular nickname.
Traditionally, the knife balisong was used for utility tasks and self-defense, particularly within Filipino martial arts systems such as Eskrima (also known as Arnis or Kali). Over time, it evolved beyond its practical roots and became associated with “flipping” — a performance skill involving acrobatic manipulations of the knife.
The standard balisong typically includes:
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A 3–5 inch blade
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Stainless steel or high-carbon steel construction
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A manual latch mechanism
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No spring-assisted opening
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Dual pivoting handles
Unlike many modern folding knives, a balisong does not rely on a lock or spring. Instead, it uses gravity and inertia, which is why some legal systems classify it as a gravity knife.
While culturally significant in the Philippines, the knife balisong is heavily restricted in the United Kingdom.
Origins in the Philippines & Cultural Roots
The balisong is believed to have originated in Batangas Province, Philippines. Historically, it was used as:
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A farming tool
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A utility knife
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A self-defense weapon
It became integrated into Filipino martial traditions and gained global recognition through films, video games, and pop culture.
Why It’s Called a Butterfly Knife
The name “butterfly knife” comes from the symmetrical handles that open outward like wings. When flipped correctly, the movement creates a flowing, butterfly-like visual effect.
Core Design & Mechanical Features of a Knife Balisong
Blade, Handles & Pivot System Explained
A knife balisong consists of:
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Blade: Usually 3–5 inches, single-edged
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Handles: Two halves that rotate around pivot pins
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Latch: Secures handles when closed
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Tang pins or zen pins: Limit rotation
Weight typically ranges between 100–200 grams, carefully balanced to allow controlled flipping.
Handle materials may include:
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Stainless steel
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Brass
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Titanium
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Aluminium
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G10 composite
Balance is critical for smooth flipping and control.
Modern Variants – Trainers, Custom Models & Bearings
In countries where legal, modern balisongs may include:
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Ball-bearing pivots for smoother rotation
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Titanium handles for weight reduction
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Trainer versions (dull blade or comb-style blade)
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Collector-grade custom builds
However, in the UK, even trainer versions are generally treated under the same prohibited category.
Uses of a Knife Balisong – Martial Arts, Utility & Flipping Culture
Role in Filipino Martial Arts (Eskrima)
Within Eskrima, the balisong was used as a:
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Close-range defense tool
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Tactical weapon
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Training instrument
Its quick deployment made it effective in self-defense scenarios historically.
Flipping as a Hobby & Media Influence
Globally, flipping has become a hobby. Practitioners perform tricks such as:
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Basic open
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Rollovers
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Fans
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Aerial tricks
Social media platforms have popularized balisong flipping content. However, this hobby is not legally permissible in the UK due to restrictions.
The knife’s appearance in movies and games has also contributed to its reputation as flashy and dramatic.
Knife Balisong Laws in the UK (2026 Update)
Criminal Justice Act 1988 & Offensive Weapons Act 1996
In the United Kingdom, a knife balisong is classified as a prohibited offensive weapon under:
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Criminal Justice Act 1988
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Offensive Weapons Act 1996
As of February 2026:
It is illegal to:
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Possess
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Buy
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Sell
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Import
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Lend
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Hire
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Give away
This prohibition applies even in private settings.
Penalties may include:
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Up to 4 years imprisonment
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Unlimited fines
The restriction applies uniformly across:
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England
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Scotland
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Wales
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Northern Ireland
Are Trainers Legal in the UK?
Even non-sharp balisong trainers are generally treated as prohibited because the classification focuses on the design mechanism, not blade sharpness.
Antiques over 100 years old may be legally owned as collectibles but cannot be carried.
Risks, Safety & Responsible Awareness
Injury Risks & Handling Concerns
Knife balisongs require skill. Without training, users risk:
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Deep cuts
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Finger injuries
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Tendon damage
Even experienced flippers occasionally sustain injuries.
Why the UK Enforces Strict Controls
The UK has strict knife laws to reduce:
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Violent crime
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Concealed weapon possession
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Public safety risks
The balisong’s rapid deployment and concealability contribute to its prohibited classification.
Legal Alternatives to a Knife Balisong in the UK
Lawful Folding Knives Under 3 Inches
UK law allows carrying:
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No automatic or gravity mechanism
These must not have a locking mechanism.
Reputable UK retailers include:
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Heinnie Haynes
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Knivesandtools UK
Always verify compliance before purchase.
Collectible Antiques & Display-Only Options
Collectors may legally own:
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Antique balisongs (100+ years old)
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Display-only historical pieces
However, carrying them in public remains illegal.
Conclusion
The knife balisong, or butterfly knife, holds cultural and mechanical significance, originating from the Philippines and gaining global popularity through martial arts and flipping culture. However, in the United Kingdom (2026), it remains a strictly prohibited weapon, including trainer versions.
Understanding the legal landscape is essential. If you are in the UK, do not attempt to purchase or possess a balisong knife.
For lawful options, consider non-locking folding knives under 3 inches that comply with UK legislation.
Always consult GOV.UK or local police guidance for the most accurate and up-to-date legal information.
FAQs
Is a knife balisong legal in the UK?
No. It is classified as a prohibited offensive weapon.
Can I own a butterfly knife at home in the UK?
No. Possession is illegal even in private.
Are balisong trainers legal?
Generally no, as the mechanism is prohibited.
What knife can I legally carry in the UK?
A non-locking folding knife with a blade under 3 inches.
What is the penalty for owning a balisong in the UK?
Up to 4 years imprisonment and/or unlimited fines.
