Slime Balls 53mm, 99a Mirror Vomits clear with reverse printed see through graphics on newly updated, wider Hardline shape.Hardline shapes feature a wide road surface for stability and consistent slide with a hard edge and conical cut for controlled tricks on coping and edges.All Slime Balls skateboard wheels are sold as sets of 4. Wheel Diameter (Millimeters)53Wheel Durometer/Hardness99aRoad Surface (Millimeters)23Wheel Width (Millimeters)34 Slime Balls Mirror Vomits 99a Skateboard Wheels Clear 53mm