Nucleus Urethane Dumbbell SetsNUCLEUS URETHANE DUMBBELLS With a permanently bonded, steel head and dual lock construction, this innovative dumbbell range even features weight indications with the opportunity to customize for your brand. The unique head shape is a mathematical transition from round at the front face to an Octagon at the rear, giving the parallel faces for anti roll benefits. DESIGN. Every aspect of the Nucleus Free Weight Range has been carefully considered over