Concrete Pump Cleaning Ball size from 1''-8'', soft, medium, and hard available, usding for Schwing, PM, Kyokuto, ... ) soft ,hard ,medium softDN80(3 inch) soft ,hard ,medium softDN100(4 inch) soft ,hard ,medium soft DN125(5 inch) soft ,hard ,medium soft DN150 ... (6 inch) soft ,hard ,medium softDN180(7inch ...