... ball and roll on bottle product name specificationmaterialapplication solid ballsize:1mm--60mmPP,POM,PA(NYLON),PC, ... cosmetic packaging, sewage disposal, and for floating. Solid ball diameter 1mm--60mm, mainly used in the ... industry of bearing.2) Plastic balls are made of different materials, such as PP,PE, ... . The tolerance can be 0.01mm with good surface and precision.3) Our products are mainly sold ...