1)PP,HDPE water cover&floating ball 2)china manufacturer for plastic hollow ball 3)certificate of ISO9001 --2008 Our company ... PE,HDPE and so onUsage:for ball bearing,cosmetic package,industrial ,track ball,and so on hollow ballsize:9.5mm--100mmPP,POM ... .4mm,29mm,35.2mm--35.56mmplastic ball+pe houldercosmetic package china plastics hollow ball for mining industry,water cover floating without grinding ...