Ravins Pro Crossbow Bolts fly true and penetrate deeply. High-strength pure-carbon construction delivers consistent downrange accuracy with minimal loss of kinetic energy. High-profile, offset 2 vanes stabilize hunting broadheads and reduce vibration. Engineered polymer nocks and high-impact aluminum nock bushings lock into Ravins unique trigger system and increase string impact strength. Also features high-impact brass threaded inserts. Inserts and nocks included. For use with Ravin crossbows only. Per 6. Length: 20. Straightness factor: .001. Wt. tolerance: 3 gr. Nocks: Ravin engineered polymer nocks. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica} span.s1 {font-kerning: none} span.s2 {font: 12.0px Verdana; font-kerning: none} span.s3 {font: 10.0px Verdana; font-kerning: none} Type: Carbon Bolts.