J&j professional toy 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 bright white toy 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 toy sized 8x8 dumbbell has 2-inch tall ends, a 2-inch wide bit and a 9/16-inch diameter bit.