Grn Mnstr Rollersports™ (green monster) is a skate company whose total focus is to produce fresh ideas and innovative product design to the roller-skating market, specifically roller derby. They produce some of the best brands known in roller derby including Antik Skate Boots®, Reckless WheelsTM, GumBall® Toe Stops, Moto Bearings™, Heartless® Agility Wheels, and Astro-nuts®.

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