TenPoint s Most Accurate 20-inch Arrow Measuring 20-inches in length, weighing 445-grains, & featuring 15.5% FOC, the CenterPunch HPX is spine-aligned to the odd color vane & is TenPoint s most accurate 20 arrow. Each arrow is inspected for straightness to within .001 and each package is weight-grain matched within 1-grain per arrow. Featuring a unidirectional carbon inner layer for stiffness, and a woven carbon fiber outer layer for impact strength, the arrow is equipped with the patented Alpha-Nock HPX. The NEW Alpha-Nock HPX features a Nock Retention Groove that snaps into the TriggerTech trigger box on the TRX 515 & TX 440 allowing the user to both hear & feel the positive engagement of the nock to the string indicating your arrow is properly locked & loaded in the crossbow. In addition, the snap-in design of the Nock Retention Groove eliminates the fit disadvantages & string wear associated with snap-on nock designs. The Alpha-Nock HPX also features an HP Aluminum Bushing for increased strength and accuracy, a deep bowstring groove, a large smooth radius base, and elongated ears. The crossbow string wraps tightly around the center of the Alpha-Nock HPX resulting in straight nock travel and precision down-range accuracy, while minimizing serving wear. Product Specifications 20-inches 445-grains 3-inch Bohning X Vanes .001 Straightness Weight-grain matched to within 1-grain per arrow. Alpha-Nock HPX Unidirectional carbon inner layer for stiffness and a woven carbon fiber outer layer for impact strength