Riedell Zebra Dart Quad Speed Skates BOOTS - Riedell Dart Man-made uppers - Comfortable padding - Low-cut boot with a sleek looking style PLATES - Powerdyne Thrust - 15 Degree polished metal trucks - Durable nylon plate -- 8mm axles -- Urethane Bushings WHEELS -Radar Dart 93A Hardness 62mm BEARINGS - ABEC-5 - Polished, chromed steel ball bearings - High quality steel races - Pre-Spun 8mm; Toe Stops: Gripper Adjustable