"Built for exceptional accuracy and maximum penetration, Killer Instinct HYPR-V Lighted Crossbow Bolts give crossbow hunters big knock-down power that's easier to see. Outfitted with Killer Instinct's lighted V-Track nock for improved accuracy and better visibility, these bolts utilize Advanced Carbon Construction for greater spine consistency that delivers greater accuracy, exceptional reliability, and repeat performance. Each 20"" bolt arrives fletched with 3"" vanes and with advanced V-Track nocks inserted. 390-grain bolt with 100-grain field point. Straightness tolerance: .003"". Weight tolerance: 1 grain. I.D.: .300"". 3 pack. Performance lighted bolt built for knock-down power and accuracy Advanced Carbon Construction - greater spine consistency, advanced hunting performance Fletched with 3"" vanes Advanced V-Track lighted nocks inserted - improved accuracy and better visibility 20"", 390-grain bolt with 100-grain field point Straightness tolerance: .003"" Weight tolerance: 1 grain I.D.: .300"" 3 pack"