... Hongda Plastics Industry Co., Ltd was established in 2003 as professional manufacture of plastic roll on ... performance, safety and reliability. Product nameSpecificationMaterialApplicationSolid ball4mm-55mmPP,PE,ABS,POM,PA,PMMATrackball,Ball valve,Bearing ball, ... on ball,and so onHollow ball9.5mm-100mmPP,PE,HDPERoll on ball,Bearing ball,Ball valve,Floating ... chat with me. DEO Rollon Ball Made In China