A light, a handle and a lantern for your tumbler. The GLOW Light Tumbler 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.