... ISO:9001:2008, FDA certification Shangyu Hongda Plastics Industry Co., Ltd was established in 2003 as professional manufacture of plastic ... Product nameSpecificationMaterialApplicationSolid 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, ...