Black Butterfly Style Knife COMB Trainer Stainless Steel Practice Training Tool Black Butterfly Style Knife COMB Trainer Stainless Steel Practice Training Tool. This Butterfly 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 satin black, powder coated finish. Imagine the look your friends will give you when they see you flip out this Balisong Butterfly Comb Knife. 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 Black, Powder Coated Finish