... hard available, usding for Schwing, PM, Kyokuto, Cifa, Sany, NameConcrete Pump Cleaning BallsizeDN25(1inch) soft ,hard ,medium softDN50(2inch) soft ,hard ,medium ... upon customer’s requirementMaterialNatural rubberApplicationCleaning the pipeline of concrete pump and concrete pump truck in construction workService Brand Schwing, PM, Kyokuto, CIFA ...