Made of pure carbon, Ravin Crossbow Bolts penetrate deeply and fly true. 2 high-profile offset vanes stabilize hunting broadheads with ease. High-impact brass-threaded inserts and aluminum nock bushings. Ravin engineered polymer nocks. 100-gr. field points or broadheads recommended. For use with Ravin Crossbows only. Length:20. Wt. tolerance: 3 gr. Straightness factor: .003. Nocks: Ravin Polymer clip-on 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.