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