Crimson Croc cut-on-contact broadheads all spin-stabilized using variable degree axial flow airfoils. The Dual-Trak Blade system is Teflon coated and has four cutting surfaces. Serrated main blade shreds flesh and trailing blade clears flesh from the Spiral Wound Channel. .040" surgical stainless steel replaceable main blades. Available in 100 grain with 7/8" cutting diameter and 125 grain with 1 1/16" cutting diameter.