... Pump Cleaning Ball size from 1''-8'', soft, medium, and hard available, usding for Schwing, PM, Kyokuto, Cifa, Sany, NameConcrete Pump Cleaning BallsizeDN25( ... sizes and types upon customer’s requirementMaterialNatural rubberApplicationCleaning the pipeline of concrete pump and concrete pump truck in construction ... PM, Kyokuto, CIFA, Sany, Zoomlion, and so on Schwing Rubber Sponge Cleaning Ball