roller skate bearings
Your bearings are inside your wheels, and are what makes your wheels spin. Each wheel uses 2 bearings, so you need 16 bearings for a pair of roller skates.
It is recommended that you skate on dry surfaces that are free from sand and debris. Over time, dirt will get inside your bearings and they will need cleaning. You can buy special bearing cleaner from your local skate shop. If you skate in water or damp surfaces, your bearings will rust, so ensure that you keep them dry! Bearings will usually need to be replaced every 6 months to 2 years, depending on how often you skate and how well you take care¯of them. There are a range of bearings on the market. The higher the ABEC number, the higher quality the bearings are.