... ,25.4mm,29mm,35.2mm,35.56mm roll on ball with holder are available 1) We are specialize in producing plastic ... balls. Hollow plastic ball diameter10mm100mm, are mainly used in the ... 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 ...