Closed with 2 metal to protect the bearing from dust or any possible contamination.Commonly used for Electric Motors, Wheel Bearings, Agricultural, Conveying and much more. 2 Pcs Mechanical equipment: 1 x Deep Groove Ball Bearing & 1 x Ball Bearing This is the perfect bearing for all your roller-skating and skateboard applications. This good 6202RZ bearing provide high speed and the convenience of removal for cleaning and relubrication. Bearing has Rubber Seals to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease., Weight: 0.19290447925 pounds, Manufacturer: Teuypty