The VIPER VENOM™ is spin-stabilized using variable degree axial flow airfoils. These patented airfoils, called Spin-Tite Airfoil Technology enable the VIPER VENOM™ to fly like mechanicals yet with all the knockdown power of fixed-blade broadheads. Wind planing is a thing of the past.Crimson Talon's VIPER VENOM™ cut-on-contact broadheads offer unsurpassed penetration while featuring the patent-pending Spiral Wound Channel that cannot close or clot insuring massive hemorrhaging and unmistakable blood trails. The result is incredibly rapid bleed-out leading to quick and humane harvests. Main blades are .040” surgical stainless steel with .020” surgical stainless bleeder blades. The 100 grain has a 1.25” cutting diameter and 125 grain has a 1.5” cutting diameter.