sponge ball for cleaning concrete pump size from 1inch-8inch, soft, medium, and hard available NameConcrete Pump Cleaning BallSizeDN25(1inch) soft ,hard ,medium softDN50(2inch) 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) soft ,hard ,medium softDN1200(7inch) ...