... are made of different materials, such as PP,PE, POM, PA,PMMA and so on. The ... Honest And Trustworthy Enterprise.Product nameSpecificationMaterialApplicationSolid ball1mm-60mmPP,PE,ABS,POM,PA,PMMATrackball,Ball valve,Bearing ball, ... Roll on ball,and so onHollow ball10mm-100mmPP,PE,HDPERoll on ball,Bearing ball,Ball valve,Floating ... look forward to receiving your order! custom made plastic balls