The general bearings are binary metal and ternary metal bearings  (It could be quarternary metal by electroplating the Indium,etc).And using the molybdenum disulfide spraying technology.  There are about 300 kinds of products including single cylinder, 2-cylinder,3-cylinder, 4-cylinder and 6-cylinder. The diameter is from Φ20 ----Φ200 mm, The width is from 15---65 mm. The width tolerance is 0.10 mm; the height tolerance of semi-circle is 0.02 mm; the thickness tolerance is 0.005 mm.