'Cartridge Ball Bearing, Double Sealed, Bore Dia. 30.00mm, Outside Dia. 62.00mm, +0/-0.013mm, Width 23.80mm, ABEC Tolerance 1, Dynamic Load Capacity 4,400 lb., Static Load Capacity 2,540 lb., Max. RPM 11,000, Temp. Range -13 Degrees to 250 Degrees F, Steel Bearing Material, Pressed Steel Cage Material, NBR Seal Material, Polyrex EM Grease'