Metallurgy Products one of the manufacturer representatives and supply all types of Polishing Media standard size and shape, white polishing spheres, white polishing triangles, white polishing cylinders. Various porcelain polishing media is our highest quality media for finishing. Porcelain polishing Media is the most durable media available different sizes include triangular, spherical, cylindrical shapes. Porcelain polishing media work for high polish and low rate attribution.