Tenpoint HEA7706 CenterPunch HPX Carbon 20" Alpha Nock .001 Straightness RedThe CenterPunch HPX is spine aligned to the odd color vane & is TenPoints 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.