CONFIGURED SPECIFICALLY FOR OUR RAIL-LESS REVERSE-DRAW CROSSBOWS20-INCH / 440-GRAINS (+/- 1-GRAIN) / BALANCED AT 16.5% FOC / .001a ^2 STRAIGHTNESSThe 20-inch 440-grain ACU-X RD arrow features a high-performance carbon shaft and a new precision spine-indexing manufacturing technique - placing the spine of the arrow in the exact configuration that has been tested and proven to perform best specifically for TenPoint's rail-less reverse-draw crossbows delivering the ultimate in consistency and long-range accuracy out of this platform.The ACU-X Snap-On Nock features our innovative Snap-On design providing an unmistakable audible "click" when properly engaged with the bowstring eliminating lateral nock travel during the shot cycle for precision long-range accuracy while preserving string center serving life.TenPoint's paired this revolutionary nock with industry-leading 2a ^2 Blazer vanes renowned for their exceptional performance across all archery disciplines delivering unmatched shot-to-shot consistency at extended ranges. ACU-X 20 arrows are equipped with a 92-grain insert - giving it a 16.5% F.O.C. for improved flight stability and accuracy.Each arrow is inspected for straightness to within .001a ^2 and each package is weight-grain matched within 1-grain per arrow. 20-inches 440-grains (with included 100-grain field point) 2-inch Blazer Vanes .001 Straightness Weight-grain matched to within 1-grain per arrow. ACU-X Snap-On Nock (Snap-On Nock weight - 29-grains)