sponge ball for cleaning concrete pump size from 1inch-8inch, soft, medium, and hard available NameConcrete Pump Cleaning BallSizeDN25(1inch) soft ,hard , ... Kyokuto, CIFA, Sany, Zoomlion, and so onTechnical Details for Sponge Ball 1. Soft Type2. Medium Type3. Hard TypeRelative density:0 ... / m2Colour : Orange Heat Resistance : + 80 0CCold Resistance : - 40.0C sponge ball for cleaning concrete pump