Nockturnal-S Lighted Nocks for Arrows with .244 Inside Diameter including various Carbon Tech, Victory, Carbon Impact, Carbon Express, Carbon Revolution, Easton, Beman and PSE Brands HIGH VISIBILITY and LONG LASTING LITHIUM BATTERIES - Shoot it at dusk, and with 20+ hours of battery life, you can still find your arrow the next day RELIABLE - Piston driven contact switch ensures L.E.D. illumination every time. Waterproof and shock resistant design is second to none NO ASSEMBLY REQUIRED - Nocks can go straight form the package to the shaft in fully operational condition. No prep work needed. Just insert it, and you are ready to shoot FITS ARROWS WITH INSIDE DIAMETER .244 - Including Carbon Tech, Victory, Carbon Impact, Carbon Express, Carbon Revolution, Easton, Beman and PSE (see Product Description for specific Models) THREE PACK PINK NOCKS - Also Available in Red, Green and Blue