Length: The TenPoint Non-Lighted Pro Elite 400 Carbon Crossbow Arrows are 20-inch long Straightness: The Pro Elite shafts are inspected for straightness to within 0.003 inches Grain Weight Tolerance: The arrows have a weight tolerance of 410 grains, which is a +/1 2-grains per dozen String-To-Nock Engagement: The Alpha-Nock HPs deep channel design increases the string-to-nock engagement by 28 percent and holds the bowstring in place during the shot which prevents 'shoot-over' or shoot-under' HP Aluminum Bushing: Its HP Aluminum Bushing increases strength and accuracy. The string on TenPoints extremely narrow crossbows wraps tightly around the center of the Alpha-Nock HP resulting in straight nock travel and precision down-range accuracy, while minimizing string serving wear