Slime Balls Dirty Donny 60mm, 78a OG Slime wheels featuring multi color neon graphic artwork by @dirtydonnyart on purple wheel with black core, custom packaging, and included silver prismatic decal. OG Slime is a versatile, symmetrical center bearing cruiser wheel shape with soft, all terrain 78a urethane. Wheel Diameter (Millimeters) 60.5Wheel Durometer/Hardness 78aRoad Surface (Millimeters) 30Wheel Width (Millimeters) 40 Slime Balls Dirty Donny OG Slime 78a Skateboard Wheels Purple 60mm