The Concave profile is already one of the grippiest wheels we’ve ever ridden, and now it’s even grippier. And the harder 81a durometer speeds things up, making this the most perfect surfskate wheel we’ve ever ridden. are always looking for ways to reduce our carbon footprint and create a more eco-friendly rider experience. The Roundhouse Ecothane Mag 65MM 81A is made in the USA from a unique formula that incorporates soybeans to offset the reliance on petroleum-based urethane. The new Roundhouse Mag wheel profile’s flexible lip brings additional grip to keep your wheels engaged with the pavement as you flow from turn to turn and offers an incredibly smooth ride. Like all of the Roundhouse wheels, these are center-set which allows you to rotate your wheels for even wear, extending their usable life. Grab a set of these earth-loving wheels and go skate for a cleaner tomorrow!