Crafted from high-tech plastic, which absorbs energy to help minimize bounce and improve control. The milk-white Invince-A-Bell never needs painting, will not chip, crack, warp, or break. Legal for use in all A.K.C. and U.K.C. trials and matches. If one of our standard sizes does not fit your needs, we offer custom sizing for an additional $5.00 per dumbbell. Call us at 1-800-642-2050 for custom sizing. (Allow 4-6 weeks delivery on custom sizes.)