Gerber Legendary Blades teamed up with legendary tactical knife designer Ernie Emerson to create the automatic opening Gerber-Emerson Alliance. The 3.5” black oxidized blade is forged from the finest 154 CM steel with a Rockwell hardness of 59-60 thus giving it strong edge retaining qualities. The handle is top grade machined 6061 T6 aluminum and finished in black. The blade spring is 300 stainless steel. Patent-pending safety pin locks the blade open or closed. Available in fine edge or serrated. The materials throughout this knife were chosen because of their quality and more importantly…their durability. When their life may depend on it…..professionals choose Gerber Legendary Blades as their manufacturer of choice.