Our ball bearings are ideal for any machine that requires superior strength and lasting performance. 608RS Skateboard Bearings Double Sealed Deep Groove Ball Bearing 8x22x7mm Widely Used in precision instruments, micro motor ect.Bearing Type: Deep groove ball bearing,Material: Bearing Steel , Lubrication: Oil ,Closures: Double sealed.Pre-Lubricated with Oil We have pre-lubricated each bearing to provide you with out of the box so that you do not need to open the bearing and add additional lubricant Long Life Service Using precision manufacturing technology to maintain the separation between moving parts to reduce rotational friction and support radial and axial loads. Double rubber sealed and metal shielded protecting the working parts of the bearing from the environmental debris that may be introduced and improve the service life.Application Moderate Load Use: skateboards, scooters, roller etc Application: 608-2RS bearing are widely used in transmission, instrumentation, motors, appliances, internal combustion engines, Skateboards, Inline Skates, Scooters, Roller Blade Skates & Long Boards, Inline & Roller Skates, yo-yo,,men women skate shoes etc.