Legal for use in all A.K.C and U.K.C. sanctioned matches and trials, our dumbbells are turned from a solid block of high-density plastic for lasting service. Milk-white color provides excellent visibility indoors or out. We offer 21 stock sizes and can make 28 custom sizes. Please call to confirm sizes before ordering a custom dumbbell. $5.00 additional for custom size. (Allow 3-4 weeks delivery on custom sizes). Note: End markings are in 1/4" dimensions: End Size x Bit Width. Note: End markings are in 1/4" dimensions: End Size x Bit Width.