Orange Addiction: Designed to have great grip, faster roll speed, plus better wear. The first wheel of its kind to use harder outer and inner urethanes that still can grip plastic floors. Its technically intricate core allows the harder urethanes to flex and compress when side loaded for superior grip during stopping and push-offs. Ideal for players 175 lbs. and over or heavier players looking for more grip. Plastic tile recommended. Yellow Addiction:Designed with the heavier or power skater in mind, the Grip + has a harder center urethane core so they may flex the wheel to match their individual skating style without compromising wear. Ideal for player's up to 180 lbs. or lighter weight players looking for faster, harder feel. Plastic tile recommended.