For use with all TenPoint and Wicked Ridge crossbows. - All TenPoint and Wicked Ridge crossbows require the use of an Alpha-Nock arrow. Failure to do so will void the manufacturer�s warranty. - Increases String-to-Nock Engagement by 28% - TenPoint�s Alpha-Nock features a deep bowstring groove a large smooth radius base and elongated ears. The string on TenPoint�s crossbows wraps tightly around the center of the Alpha-Nock resulting in straight nock travel and precision down-range accuracy while minimizing string serving wear. - The Alpha-Nock�s deep groove and large radius base �holds� the bowstring in place on extremely narrow crossbows to prevent �shoot-over� or �shoot-under�.- *Available as a 6-pack