... 05mm,25.4mm,29mm,35.2mm,35.56mm roll on ball with holder are available 1) We are specialize in producing ... ,PE, POM, PA,PMMA and so on. The tolerance can be 0.01mm with good surface and precision.3) Our products are ... PA,PMMATrackball,Ball valve,Bearing ball, Roll on ball,and so onHollow ball10mm-100mmPP,PE,HDPERoll on ball,Bearing ball,Ball valve,Floating ball,and so onRoll on ball and holder8mm ...