... ball for pipe cleaning:Concrete Pump Cleaning Ball size from 1''-8'', soft, medium, and hard available.Main Products: ... hard ,medium softOD 60mmDN80 (3 inch) soft ,hard ,medium softOD95mmDN100 (4 inch) soft ,hard ,medium softOD124mm DN125(5 inch) soft ,hard , ... medium softOD150mm DN150(6 inch) soft ,hard ...