Slime Balls X Creature Skateboards Atomic Light Ups 60mm, 78a Glow in the Dark wheels featuring graphic art by koolaidmustache, with digital multi-color printed graphics and green LED lights. Glow in the dark urethane is charged by rolling and glow bright, even after you stop.Slime Balls Light Ups wheels feature LED lights that light up when you roll, powered by the rotation of the special wheel spacer and wheel core. No batteries required. Light Ups come with removable / replaceable Bronson Speed Co. G2 bearings. Slimeballs OG Slime shape is a versatile, symmetrical center bearing cruiser wheel with soft, 78a urethane.