[20 608 RS Bearings]: Each set contains 20 608 2RS bearings(Blue). The size of each bearing is 8MM in inner diameter, 22MM in outer diameter, and 7MM in height. A large number can meet your long-term use needs. [High-quality Carbon Steel Material]: Our bearings are made of high-quality carbon steel materials. Has good flexibility and abrasion resistance. Compared with other ordinary steel materials, its production process is more complicated, better quality, more durable and not easy to rust. Therefore, the weight that can be carried is also higher. [Non-contact Detachable Shield]: Our bearings have a non-contact detachable shield. It can prevent the entry of some dust and impurities. It is also convenient for you to clean it. If you want to prolong the service life of the bearing, please keep the bearing clean, dry and regularly keep lubricating oil. [ABEC-9 Bearing Good Flexibility]: ABEC-9 bearing has high precision and good flexibility. The production process is very rigorous. Each bearing has two blue rubber seals, which can effectively reduce friction. When the skateboard is running, the noise made by it is small. And to help them increase the speed of operation. [Best Roller Skating Accessories for Skaters]: Our bearings are very suitable for skateboards, longboards, skates, inline skates, trolleys, etc. It is also suitable for other sports equipment that can be installed with our bearings.