... ABS,POM,PA,PMMATrackball,Ball valve,Bearing ball, Roll on ball,and so onHollow ball10mm-100mmPP,PE, ... .4mm,29mm,35.2mm,35.56mmPE,PPCosmetic packagingGlass roll on bottle10ml,25ml,30ml,40ml,45ml,50ml,75ml, ... 80mlGlassCosmetic packagingPlastic roll on bottle6ml,30ml,40ml,50ml,60ml,75ml,120mlPPCosmetic ... look forward to receiving your order! 5/8''(15.875mm) POM solid ball