... balls are made of different materials, such as PP,PE, POM, PA,PMMA and so on. The tolerance can be 0 ... ) Honest And Trustworthy Enterprise.Product nameSpecificationMaterialApplicationSolid ball1mm-60mmPP,PE,ABS,POM,PA,PMMATrackball,Ball valve,Bearing ball, Roll on ball,and ... with low prices.We look forward to receiving your order! custom made plastic balls