Rage expandable broadheads feature revolutionary Slipcam Rear Blade Deployment System, which gives you 3 big advantages. Eliminates deflection, guaranteed fully deployed blades and no loss of kinetic energy. Exclusive Shocklock System holds blades in place in flight acts as a shock absorber for blades. No rubber bands. Stainless-steel instant-cut tip, machined from aircraft aluminum, 3/4" in flight 2 blade are .035 thick with a 2" cutting diameter, 3 blade are .030 thick with a 1 1/2" cutting diameter. Free practice head included in every pack.