... balls are made of different materials, such as PP,PE, POM, PA,PMMA and so on. The tolerance can be 0.01mm ... are mainly sold to European and American area.4) Honest And Trustworthy Enterprise.Product nameSpecificationMaterialApplicationSolid ball1mm-60mmPP,PE,ABS,POM,PA,PMMATrackball,Ball valve ... prices.We look forward to receiving your order! 6mm Red PP Plastic ball