TenPoint Crossbow Technologies Evo-x Center Punch Alpha Blaze Xbow Arrows .001in 16in Pack of 3 Green. s Aluminum Bushing. Upon firing the crossbow the bowstring?s force compresses the two pieces and activates the lighted nock. Deactivate the easy on/off Alpha-Blaze lighted nock by pulling the nock straight out until the light turns off ? no tools required. The LED light of the Alpha-Blaze system lasts for approximately eight hours when activated. The system features TenPoint's Alpha-Nock HP that is equipped with an HP Aluminum Bushing for increased strength and accuracy. Specifications for TenPoint Crossbow Technologies Evo-x Center Punch Alpha Blaze Xbow Arrows: Manufacturer: TenPoint Crossbow Technologies Archery Application: Hunting Color: Green Fabric/Material: Carbon Fiber Quantity: Pack of 3 Length: 16 in Weight: 400 grain Nock Type: Alpha-Nock HP Straightness: 0.001 in Size: 16 in Package Contents: TenPoint Crossbow Technologies Evo-x Center Punch Alpha Blaze Xbow Arrows TenPoint Crossbow Technologies HEA-759.3: Evo-x Center Punch Alpha Blaze Xbow Arrows .001in 16in Pack of 3 Green