The redesigned x-treme, now with the exclusive nc (no collar) blade retention system eliminates the need for a shock collar, dental band or o-ring. Taking verse from the original x-treme, the new-for-2020 2-blade design is centered around a 1. 425-Inch long high-strength 6061-t6 aircraft grade aluminum ferrule whose two. 039-Inch thick blades instantly deploy to an enormous 2. 3 Inches upon impact. Available in two new 100-grain versions that bolster either a cut-on-contact leading-blade tip or a bone-crushing chisel tip, fans of the x-treme will find the performance they command in these great heads.