... soft, medium, and hard available, usding for Schwing, PM, Kyokuto, Cifa, Sany, NameConcrete Pump Cleaning BallsizeDN25(1inch) ... (8inch) soft ,hard ,medium softOther sizes and types upon customer’s requirementMaterialNatural rubberApplicationCleaning the pipeline ... and concrete pump truck in construction workService Brand Schwing, PM, Kyokuto, CIFA, Sany, Zoomlion, and so on PM Sponge Rubber Cleaning ...