The york 20kg 44lbs rubber hex dumbbell is perfect for building strength and muscle toning the dumbbell can be used for performing biceps curls lateral or frontal movements that challenge the arms triceps exercises or back exercises it features an anti roll safety design that prevents it from rolling away when not in use rubber coated heads ensure safety for equipment and surfaces and are permanently affixed to a thick 35mm firm steel shaft to improve the strength of the headhandle jo