Trainer Stainless Steel Butterfly Style Knife COMB Trainer Stainless Steel Butterfly Style Knife COMB Practice Training Tool. Imagine the look your friends will give you when they see you flip out this Balisong Butterfly Comb Knife. This Comb Knife is ideal for practicing your flipping safely and maintaining your short or long locks. It is 8.75 inches long when open and the stainless steel is heat treated along with having a titanium protective layer and silver satin finish. Specifications Overall Length: 8.75 Inches Comb Length: 4 Inches Comb Material: Heat Treated Stainless Steel Comb Thickness: 1mm Closed Length: 5.125 Inches Other Features: Flashy Comb, Identical to a Balisong Butterfly Handle: Heat Treated Stainless Steel, Hex-Head Hardware Lock or Securing Latch: Tail End Lock Finish: Satin Bare Metal Finish