1.Alumina balls 2.90%,92%,95%,97%,85% 2.Size:1-80mm ... abrasion resistance&high hardness 5.SGS,ISO High alumina grinding balls(rolling) The strength of alumina ball by rolling is about ... materials, chemical, inks, cosmetics etc Note: we can pack the balls according to your requirements, and also OEM or ODM. Alumina ...