For shooters who want blades that are visibly sharp and strong, the Thunderhead Broadheads feature high-carbon-steel Trophy Tips and Diamize-edge stainless-steel blades. Slimline ferrule improves flight and penetration. Lock ring blade retention system. Blades are 0.03" thick with a 1-1/8" cutting diameter. Comes in a pack of 5 broadheads.