The Nebo® GLOW™ light handle not only makes your 30 oz or 20 oz. tumbler easier to hold and carry, but also gives you the power of light without moving a finger. No more slipping, dripping or tripping in the dark while trying to balance your tumbler when your hands are full. The GLOW™ fits most standard vehicle cup holders, and perfectly holds your tumbler secure with the rubberized grip ring. Nebo® GLOW™ Tumbler Handle, 4-5/8 in Width, Rubber