Steel Force Premium 100gr Fixed Blade - 3 Pack - The Steel Force Premium 4-blade 100g broadheads are constructed from the finest knife grade, non-serrated stainless steel, precision cut using the latest state of the art laser equipment and carefully tempered to 49-51 Rockwell hardness. Each head is individually ground, stropped to a razor finish, and then assembled and tested for absolute uniformity. Cut on contact design Knife grade stainless steel main blade .040in and .050in thick 49-51 Rockwell harness 7075 Aircraft grade aluminum ferrule Replaceable main and bleeder blades Razor sharp, perfect flight characteristics Aggressive angle of attack produces superior penetration Patented blade locking system