Concrete Pump Cleaning Ball size from 1''-8'', soft, medium, and hard available, usding for Schwing, PM, Kyokuto, Cifa, ... BallsizeDN25(1inch) soft ,hard ,medium softDN50(2inch) soft ,hard ,medium softDN80(3 inch) soft ,hard ,medium softDN100(4 inch) soft ,hard ... (6 inch) soft ,hard ,medium softDN180(7inch) soft ,hard ,medium softDN200(8inch) soft ,hard ,medium softOther sizes and types upon customer ...