Heelys - Revolution K (Black/Silver) - Men's: The revolution is a Must-Have!; Brushed synthetic with breathable mesh upper. PU midsole. New extra wide Mega Wheels (sizes 1-6= 46mm, 7-8= 48mm, 9-12= 50mm). ABEC 7 608 bearings. Steel Coin Axle.; Includes Sole Save heel plug and removal tool. Wave comfort heel bracket. Theft-proof wheel packaging. Clear PU wheels with molded-in graphics. External heel stabilizer.