Atom Pulse Outdoor Wheels are an outdoor skater's best friend. The soft, high-rebound urethane reduces the nasty vibration that you get from outdoor surfaces. Atom has also added a cavity on the back of the wheel allowing for amazing flex, providing a smoother ride and an increased life span. Brand new skaters and experienced experts will both appreciate the Pulse's amazing feel and consistently awesome ride. It's recommended for fitness and trail skaters, as well as those dealing with rough surfaces like asphalt. Set of 8 Wheels Hardness 78A Height 65mm (Pulse) Width 39mm (Pulse) Weight (per Wheel) 114g (Pulse) Got these two skate outdoors, but I never bring my quad skates out, just my inline skates. I use my quads indoors, so I don't need these wheels really. Haven't actually used them, so they are new, just not in packaging.