How to use a butterfly knife by Grommet's Knife and Carry - All about butterfly knives by Grommet's Knife and Carry - Learn how to hold and use a butterfly knife -
Butterfly Knife Tricks for Beginners #4.2 (Sidekick) - YouTube
Butterfly Knife, Trainer Practice Tool Steel Metal Folding Knife Unsharpened Butterfly Knife Comb for Practicing Flipping Tricks (Black and Silver, Set of 2) : Amazon.ca: Sports & Outdoors