Learn to skate like a professional in the Roller Derby Boys' Laser 7.9 MX Quad Skates. These skates feature a reinforced comfort fit boot with heel stabilizers to help you skate comfortably. The padded collar protects your ankles, and the hook-and-loop power strap ensures a secure fit. The 54mm clear urethane wheels with Pro Core are both durable and stylish. Tru Trac frame.