Cheezeball Bearings are worn by some of the top ladies and men in Roller Derby and are great for indoor or outdoor use. Cheezeball Swiss skate bearings stand up to the intense pressure that derby skaters constantly place on their bearings. Most skate bearings are great when they are first placed in your wheels, but what's important is how they feel after skating for hours on them. Plus, with a bronze cage, you'll have faster response. These bearings are sealed tight to keep out dust and debris from the outside which allows them to stay smooth and fast for the race inside. Comes in a set of 16.