The EVO-X CenterPunch Bolts improve crossbow accuracy by a remarkable 25% when compared to other bolts. They use exclusive Lazer-Tech carbon weave to reduce spine variation by 80% and increase strength by 40%, resulting in less breakage and better accuracy by reducing ovalizing at launch. The modulus carbon fiber is rated at 33 million-pounds-per-square-inch. The patented Omni-Nock system allows for easy nock changing and lighting capability. The 445 gr. bolts are equipped with 84-gr. lead-free brass inserts and 3.5 Bohning X Vanes. Recommended field point size: 20/64 (not included). Inserts and nocks included. Per 6. Length: 20. Straightness factor: .001. Wt. tolerance: 1 gr. Nocks: Omni-Nocks, moon nocks. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Carbon Bolts.