NAP Killzone Maxx Mechancial Broadhead 100 Grain Two Blade 2 3/8" Cutting Diameter 3 Pack 100 grain, 3 pack 2 3/8" cutting diameter Recommended for bows shooting 60-pound draw weights or greater Designed for use out of compound bows up to 350 fps Spring clip design - No 0-rings or rubber bands Features patented "Spring Clip" blade retention system to keep blades closed in flight Massive 2-3/8" cutting diameter for devastating wound channels Durable, Razor-sharp .035" blades Recommended for bows shooting 60-pound draw weights or greater Designed for use out of compound bows up to 350fps