The rifle cartridge is constructed from durable zinc aluminum to brace for impact and not to damage the userís hands or fingers. To be able to keep your knuckle with you a pin is included to use it as a best buckle. Wait! To sweeten the deal there is a knife hidden in the cartridge. So to recap you have a knuckle, buckle, and knife all in one. What a great deal and to top it off you have the cool bullet design. Any Rifleman would be lucky to have the Ammunition Cartridge Rifleman Bullet Knuckle Knife.