The Crossbow XPR enginerred on a shorter ferrule with higher mass- centralization than the Hypershock and Tremor. Designed with the XPR blades for a super-effcient shape and added Cut-on-Contact rear deployment blades that create a devastating entry wound channel. THe crossbow XPR has the "physics" based inboard center-of-gravity blade geometry, meaning the XPR blade cannot open on release, but will open in game everytime. 125 grain has a 2" cutting diameter and the 100 has a 1.375" cutting diameter.