We're thrilled that the wheel was invented, because now we get to spend our lives roller skating on them! Wheels come in a variety of sizes, hardnesses, and even colors! Whether you'll be skating indoor, outdoor, jamming, dancing, park skating, playing derby or just looking to have some good old fashion FUN, wheels are the surefire way to change your skating experience. A gummy wheel is good for outside skating, to be able to maneuver around all that debris, whereas a harder wheel will best be skated on at the rink or other types of harder, indoor surfaces.