The Stainless Extreme features 100 percent stainless tip, blades and ferrule, all made from the strongest material that still maintains the flex necessary for superior penetration. These heads are small, fast, accurate and deadly and since the aluminum ferrule has been replaced with heavier stainless steel, the head carries more energy in a smaller package for unrivaled results on the toughest shots. 100 Grains 3 pack. Cutting Diameter 1 1/16?.