Features of Atom Boom SLIM 59x38mm FIRM 86A White and Pink Hybrid Roller Skate Derby Wheels (4-pack) PACKAGING: Sold in 4 Packs. Order 2 for a pair of skates.SURFACES: Sport Court, Concrete, and Wood FloorTECHNOLOGY: BOOM THANE FormulaHARDNESS: HYBRID - FIRM (≈86A)SIZE: 59x38mm COLOR: White / Pink..