Slime Ball Wheels Corey OBrien Reaper Glow In The Dark Skateboard Wheels 99a 56mm. Slime Balls 56mm, 99a Corey O'Brien Reissue Speed Balls wheels with high performance Glow in the Dark urethane and super versatile Vomit Mini shape with radial cut on one side and conical cut on the other for customizing your setup.