25.4mm plastic hollow ball 1)various colors and sizes can available 2)used in cosmetic packaging,ball valve 3)good quality ... ,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, ...