... ,PE,HDPERoll on ball,Bearing ball,Ball valve,Floating ball,and so onRoll on ball and holder8mm, 10mm,19.05mm,25.2mm,25.4mm,29mm,35.2mm ... sewage disposal, and for floating. Solid ball diameter 1mm--60mm, mainly used in the industry of bearing.2) Plastic balls are made ... ,PE,HDPERoll on ball,Bearing ball,Ball valve,Floating ball,and so onRoll on ball and holder8mm, 10mm,19.05mm,25.2mm,25.4mm,29mm,35.2mm ...