Concrete Pump Cleaning Ball size from 1''-8'', soft, medium, and hard available, usding for Schwing, PM, Kyokuto, Cifa, ... inch) soft ,hard ,medium soft DN125(5 inch) soft ,hard ,medium soft DN150(6 inch) soft ,hard ,medium softDN180(7inch) soft ,hard ,medium softDN200(8inch) soft ,hard ... Schwing, PM, Kyokuto, CIFA, Sany, Zoomlion, and so on Schwing Rubber Sponge Cleaning Ball