PU12X38X10-2RS PU Covered Bearing 12x38x10mm - Sealed - MiniaturePU12X38X10 2RS Polyurethane Rubber PU12X38X10 2RS Polyurethane Rubber Bearing with tire 12x38x10mm Sealed Miniature PU12X38X10 2RS Polyurethane Rubber sealed Ball Bearing 12mm x 38mm x 10mm Polyurethane ( PU) is a new type of polymer composite materials between rubber and plastic, offering higher load bearing capacity compared to plastic, polyurethane offer superior impact resistance, while good mechanical properties. Polyurethane have better abrasion