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