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Roller Derby Viper Womens Speed Roller Skates 2009: The Viper M1 roller skates from Roller Derby were designed to give you speed, support, and comfort while being very pleasantly priced. The Viper M1 boot has a deluxe speed profile with reinforced support. For extra comfort the collar is padded and the closure system is simply lacing up then giving the Velcro power strap a tug. With features like these and the RTX Pro chassis with 58mm Mag Core urethane wheels, you will find the Viper M1 to be an affordable entry into the world of quad skating.