Super Strong Clear Polycarbonate Construction Available in Strobing or Non-Strobing Versions Available Colors: Red/Green, Blue/Green, Red/Blue, Red, Green, Blue, Orange, White, Pink 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 20+ Hour Battery Life 3-Pack