What Is a Balisong Knife? A Complete Guide to Butterfly Knives

What Is a Balisong Knife?

A balisong (bah-lih-SONG), commonly known as a butterfly knife, fan knife, or Batangas knife, is a folding pocket knife with two handles that rotate around the tang of the blade. When closed, the blade is concealed within the handle. When opened, the two handles rotate to form the knife's grip. The balisong is one of the most mechanically fascinating knife designs ever created, combining artistry, engineering, and centuries of tradition.

The balisong's unique opening mechanism — a technique called "flipping" or "fanning" — has spawned an entire subculture dedicated to the art of butterfly knife manipulation. But beyond the tricks and flips, the balisong is also a genuinely functional cutting tool with a rich history spanning continents and centuries.

Origin of the Name

The term "balisong" derives from the Tagalog words bali (meaning "broken" or "folded") and sungay (meaning "horn"). The original balisong handles were carved from animal horn and bone, and the name reflects the broken/folded nature of the knife's design.

The term "butterfly knife" is a Western name that gained popularity due to the way the two handles flap open like butterfly wings. Other names include "fan knife," "click clack," and "Batangas knife" (after the Philippine province famous for balisong production).

History and Origins

The Philippine Origin Theory

The Philippines is widely recognized as the birthplace of the balisong. Filipino balisong-making dates back to at least the early 1900s, with the town of Taal in Batangas province serving as the epicenter of production. Filipino balisongs were — and still are — practical tools used by farmers, fishermen, and everyday workers as utility knives.

Traditional Filipino balisongs feature:

• Carved bone, horn, or wooden handles
• Simple, leaf-shaped or tanto-style blades
• Pangut closures (vein tendons from large animals) for handle tension
• Hand-forged blades from simple carbon steel

Alternative Origin Theories

Some historians trace the balisong concept back to France, where a knife called the "pied du roi" (king's foot) measurement tool used a similar pivoting handle design in the 18th century. Others point to similar folding knife mechanisms in ancient Roman or European designs.

Regardless of the exact origin, the Philippines refined the balisong into the iconic design we know today, and Filipino craftsmanship remains the gold standard for traditional balisong production.

Anatomy of a Balisong

• Blade: The cutting edge, typically a tanto, clip point, or drop point design
• Tang: The portion of the blade that extends between the handles; the pivot mechanism attaches here
• Tang pins: Small pins that hold the handles in the open and closed positions, preventing the handles from over-rotating
• Zen pins / bumpers: Small pins that prevent the handles from hitting each other (reducing cracking and chipping)
• Safe handle (bite handle): The handle you grip when cutting — it closes against the spine of the blade for safety
• Latch handle (kick handle): The handle that contains the locking mechanism
• Latch: The locking mechanism — can be a lever latch, magnetic latch, or spring latch (batangas style)
• Swedge: A false edge on the spine of the blade that reduces weight and adds aesthetic appeal

Types of Balisong Latches

The latch system is one of the most important features of a balisong:

• Batangas latch: The traditional Filipino design using a spring-loaded lever on the bite handle. Authentic and simple.
• Manila latch: A spring-loaded latch on the latch handle. Named after the Philippine capital, it's another traditional style.
• Magnetic latch: Uses magnets to hold the handles closed. Modern, clean, and eliminates the risk of latch-related injuries during flipping.
• Latchless: No latch at all — the knife is held together by pivot tightness and zen pins. Popular among advanced flippers for the smoothest possible action.

The Art of Flipping

Balisong flipping — the practice of opening, closing, and manipulating the knife through a series of coordinated hand movements — has become a global subculture with its own competitions, tutorials, and community.

Basic Flipping Techniques

• Y-opening: The most basic opening, where the bite handle is flicked out first, followed by the latch handle
• Zen rollover: A rollover technique that transitions the knife from one hand position to another
• Infront twirl: The knife rotates around the fingers in front of the body
• Behind-the-back (BTB): Advanced manipulations that pass the knife behind the back

Flipping Safety

Flipping a sharp balisong without training can result in serious cuts — most practitioners go through a "training knife" phase using:

• Dull blade trainers (no sharp edge, same weight and mechanism)
• Practice balisongs with intentionally loose tolerances
• Knot tying drills on the bite handle to build muscle memory

Balisong in Pop Culture

The balisong's distinctive design and opening mechanism have made it a fixture in popular culture:

• Featured prominently in action movies (notably the "Kickflip" scene in various films)
• A symbol of rebellion and counterculture since the 1970s-80s
• Popularized in video games, anime, and social media (TikTok, Instagram)
• Subject of legal controversy due to its association with gangs and violence in certain periods

Modern Balisong Industry

Today's balisong market spans from traditional Filipino hand-forged knives to high-tech precision instruments:

• Traditional makers: Artisan Filipino makers producing hand-forged balisongs with bone/horn handles
• Modern production: Companies like Benchmade (the Bailout 537 Mini is a modern balisong-inspired design), WE Knife, and independent makers producing precision CNC-machined balisongs with modern steels
• Flipper trainers: Companies like FlyGang, Squid Industries, and Tactile Knife Co. produce high-quality training balisongs
• Custom makers: Many knifemakers specialize in custom balisongs, which can command prices of $500-$5000+

Balisong Legality Quick Reference

• USA: Legal federally; state and local laws vary significantly (see our state-by-state guides)
• Philippines: Legal and culturally significant; a traditional tool and craft
• UK: Illegal to carry or possess
• Canada: Restricted under the Criminal Code
• Australia: Prohibited weapon in most states