Victory VForce Sport 500 spine Carbon Arrows - 12 Pack - The VForce arrow has defined the industry standard for high quality hunting arrows since day one. Highly advanced carbon engineering helped to craft this 100% all carbon shaft with incredible consistency and durability. If you want one of the toughest, most dependable hunting shafts on the market, then the VForce is for you. Standard diameter shaft made from high quality carbon composite fibers Spine indexed Straightness tolerance: +-.006in