The 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.