Bearings: 10 pack skateboard bearings inner diameter is 8 mm, outer diameter is 22 mm, overall width is 7 mm, yellow colorDouble cap seal: 608 2RS skateboard bearings have non-contact, removable shield for easy cleaning; Good for skateboards, inline skates and scootersDouble shielded: this bearing is shielded on both sides to keep lubricant in and keep environmental debris out to avoid reducing speed and lifespan of bearingsNote: If you use it for the main spin bearing of finger toy, please make sure the size of bearing is 608 bearing and clean the oil of bearings; The oil can anti-rust and lengthen life, but will reduce the speedNew bearings might have a slow speed at first, it will be quicker after several times use; If you want to keep your bearings a lengthen lifespan, please keep bearings clean, dry and maintain with slushing oil and lubricating oil regularly