... 19.05mm,25.4mm,29mm,35.2mm,35.56mm roll on ball with holder are available 1) We are specialize ... 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 ...