PU10X40X12-2RS PU Covered Bearing 10x40x12mm - Sealed - MiniaturePU10X40X12 2RS Polyurethane Rubber PU10X40X12 2RS Polyurethane Rubber Bearing with tire 10x40x12mm Sealed Miniature PU10X40X12 2RS Polyurethane Rubber sealed Ball Bearing 10mm x 40mm x 12mm 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