This Skull Custom Tactical Response TR-4 is #1 of 10! It has a solid 416 stainless steel frame with a two-tone finish, satin faces and stonewashed sides and recesses. The handle features a deep relief skull and barb wire engraving by Bruce Shaw. The bottom of the handle is marked with "Bruce Shaw" and "#1 OF 10". The push button is mother of pearl, the back spacer is DLC black and the pocket clip is titanium. The blade is Chad Nichols Damascus steel. This knife, like all of Protech's Tactical Response series knives fires hard and feels great in hand.