J&j professional Large size dog obedience molded white plastic dumbbells are legal for use in all a.K.C. And U.K.C. Sanctioned matches and trials. The white Large size dumbbell has a slight texture molded into the surface of the bit, giving your dog a better grip. Though they are made from a non-toxic plastic, they are not designed to be a "chew toy" and should not be left with an unattended dog. The Large sized 12x14 dumbbell has 3-inch tall ends, a 3 1/2-inch wide bit and a 15/16-inch diameter bit.