Features: – Super Strong Clear Polycarbonate Construction – Waterproof and Shock Proof – Available in Strobing or Non-Strobing Versions – Available Colors: Red Green Red/Green Strobing – Fits X H S and GT Arrows – H (white bushing) = Fits smaller diameter carbon .233 ID shafts – GT (black bushing) = Fits smaller diameter carbon .246 ID shafts – S (gray bushing) = Fits standard carbon .244 ID shafts – X (no bushing) = Fits smaller diameter carbon .204 ID shafts – Each nock in this package weighs approximately 25 grains – Delivers more than 20 hours of lithium-powered battery life – 2-Pack – Advancing the lighted nock design by which all others are judged Nockturnal Shift FIT lighted nocks take the simplicity and reliability of the world’s most dependable and user-friendly lighted nock to an entirely new level. Thanks to the external on/off switch the process of shifting an ultra-bright string activated Nockturnal lighted nock off has never been easier. Just slide the switch and the nock turns off. It’s that simple! With 20+ hours of long-lasting battery life and a durable design these nocks are built to last and perform like none other. Constructed of an ultra-strong impact resistant polycarbonate casing that protects the super-bright LED lights Shift nocks deliver on what users have come to expect from Nockturnal lighted nocks. The patented string-activated piston-driven contact linear switch triggers the nock to illuminate immediately when the string is released and can be quickly turned off with the newly integrated external switch a true evolution in the world’s most reliable lighted nock system.