The TenPoint ACU-X Premium Carbon Arrows are configured specifically for rail-less forward draw crossbows. Each 20-inch arrow weighs 440 grains (+/- 1 grain) and features a balanced 16.5% front of center (FOC) for enhanced flight stability. These arrows are manufactured with a high-performance carbon shaft and utilize a new precision spine-indexing technique for optimal performance.Key FeaturesACU-X Snap-On Nock: Innovative design with an audible click when engaged, reducing lateral nock travel for improved accuracy.Blazer Vanes: Equipped with industry-leading 2-inch Blazer vanes known for exceptional performance across all archery disciplines.Weight-Grain Matched: Each arrow is weight-grain matched within 1 grain for consistent performance.Straightness Inspection: Each arrow is inspected for straightness to within .001 inches, ensuring high precision.