Atom Pulse Quad Outdoor Roller Skate Wheels - 78A Hardness for Roller Derby & Outdoor Skates - Your Choice of Wheel Colors! - Outdoor Roller Derby Skating Replacement Wheels - Be sure to try out the best selling outdoor wheels available today from Atom Wheels - the Atom Pulse Outdoor Wheels! Atom Pulse outdoor wheels feature an ultra high quality 78A urethane formed in an extra large size wheel - 66MM to be exact! Add all this together and you"ll feel like a monster truck rolling over rocks and debris outdoors or on the roller derby track with these new Atom Pulse wheels. These Atom Pulse outdoor wheels are more than perfect for outdoor recreational skating but perform beautifully under the rough conditions of roller derby. For the price these are a steal! No other wheel on the market today is as hot or high performance as the Atom Pulse outdoor derby skate wheel. These Atom Pulse wheels have been known to sell out quickly so get yours while you can before the season is over! - Perfect for: Sidewalk/Boardwalk