BIM is a conventional fully-lubricated bimetallic bearing material, based on steel backing with copper sinter layer as the sliding surface. There are four kinds of copper powders available for the possible material as the copper sinter layer:

CuPb10Sn10/CuPb24Sn4/CuPb30/AlSn20Cu. Grooves or pockets on the surface of sinter lining are usually punched as oil or grease reservoirs.