... ball4mm-55mmPP,PE,ABS,POM,PA,PMMATrackball,Ball valve,Bearing ball, Roll on ball,and so onHollow ball9.5mm-100mmPP,PE,HDPERoll ... on ball,Bearing ball,Ball valve,Floating ball,and so onRoll on ball and holder8mm, 10mm,19.05mm,25.2mm,25 ... .My name is Jane,welcome to chat with me. 1.3" Clear Plastic Hollow Balls