One of the best hunting arrows ever designed by BloodSport, the Onyx Microdiameter Carbon Arrows combine exceptional toughness and flight ability with Blood Ring technology. Proprietary Rugged Wrap construction gives you a microdiameter arrow with a much thicker carbon wall than comparable shafts. Its small diameter delivers incredible penetration, minimal wind drift and a high Front of Center (F.O.C.) measure for optimal accuracy and penetration. Blood Ring technology captures blood as it passes through the animal so you can evaluate the hit on pass-through shots and make the best tracking decision. Pre-fletched with 2 vanes. Per 6. Straightness factor: +/-.004. Wt. tolerance: +/-1 gr. Sizes: 350, 400. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.