TenPoint ACU-X Snap-On Lighted Nock Features The TenPoint ACU-X Snap-On Lighted Nock combines the nock and LED into a single easy-to-use unit eliminating the assembly steps that slow down other lighted nock systems. Upon firing the bowstring s force compresses the two halves of the nock and triggers the super bright LED giving hunters a clear visual trace of arrow flight from release to impact. The nock retention groove lets shooters feel and hear positive engagement with the string on TenPoint rail-less crossbows adding confidence before every shot. Rated for use at 515 plus feet per second the ACU-X is built to handle the speeds of TenPoint s fastest crossbow platforms without failure. Each nock runs for approximately 24 hours once activated and deactivation is as simple as pulling the nock straight out until the light turns off a process made even easier with TenPoint s Bednar Perfect Puller 2.0. At 27 grains per nock the ACU-X adds minimal weight to arrow setups while still delivering a bright trackable light signature after the shot. This pack contains three lighted nocks giving hunters enough for a full quiver without needing a separate HP aluminum bushing purchase which is sold separately. For hunters who want reliable bowstring-activated visibility built specifically for TenPoint s rail-less system the ACU-X Snap-On Lighted Nock delivers dependable performance shot after shot. Tenpoint ACU-X Snap-On Lighted Nock Specifications Manufacturer: Tenpoint Model: ACU-X Snap-On Lighted Nock Type: Lighted Crossbow Nock Color: Green Package Quantity: 3 Nock Weight: 27 Grains Battery Life: Approximately 24 Hours When Activated Speed Rating: 515+ FPS Bullet Weight: 27 Grain Available At: GrabAGun