Fist Knuckles Black Aluminium Alloy Light - Cakra EDC GadgetsFull Aero Aluminium Alloy Made, anti rust, solid, 15 mm thickness, your fingers will be protected perfectly Handmade polishing, the surface is very smooth CNC processing with Computer Carving Machine, all edges are treated very carefully Black Oxide Finish, very cool! Light weight, but very solid Great Self Defense Knuckles Size: 111mm x 75mm x 15mm Weight: 150g