The Carbon Express PileDriver series is engineered for the hunter who wants ULTIMATE penetration. The CX PileDriver Hunter is the heaviest arrow in the Carbon Express line to create maximum kinetic energy and greater knock down power. Built-in Weight Forward technology delivers superior down-range accuracy.á For those that choose fletched PileDrivers, theácompact Predator vanes allow for extra arrow velocity. Ultimate Penetration - Heaviest arrow in the Carbon Express line for ultimate penetration and knock down power.Innovative Built-in Weight ForwardÖ Technology - Superior down range accuracy with a broadhead.BuffTuff« - World's toughest carbon arrow finish in Mossy Oak« camouflage pattern.Predator Vanes - High performance compact design for added arrow velocity and greater accuracy. BulldogÖ Nock Collar - unrelenting strength and durability for nock end impacts.Straightness: ¦ .005" max. Weight Tolerance: ¦ 1.0 grain.