1.30mm POM,PP solid ball 2.we can do all kinds plastic ball,roll on ball,roll on bottle product name specificationmaterialapplication solid ... so on. The tolerance can be 0.01mm with good surface and precision.3) Our products are mainly sold to ... ,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 ...