"EVO-X CenterPunch Premium Carbon Crossbow Arrows with Alpha Nock HP combine superior performance with superior visibility when it counts. Made of a strong modulus carbon fiber at 33 MSI, these 20"" arrows come wrapped in an exclusive LAZER-TECH carbon weave that increases spine consistency by 80% and overall strength by 40%. Each comes outfitted with TenPoint's Alpha Nock HP with deep bowstring groove, large smooth radius base, and elongated ears. The tight-fitting connection between string and nock results in straight travel and precision down-range accuracy with minimal string serving wear. Nock bushing enhances strength and accuracy. Fletched with slightly offset 3"" Bohning X Vanes for maximized downrange accuracy and optimized consistency. Fitted with an 84-grain insert. Straightness Tolerance: +/-.001"". Weight Tolerance: +/- 1 grain. F.O.C.: 17%. Inside Diameter: .297"". 3 pack. EVO-X's most accurate crossbow arrows Strong modulus carbon-fiber construction LAZER-TECH carbon weave increases strength and consistency Alpha Nock HP nock and nock bushing Slightly offset 3"" Bohning X Vanes Fitted with an 84-grain insertNOTE: Alpha-Brite nocks feature the deep groove of the TenPoint Alpha-Nock for use with any TenPoint crossbow."