sponge ball for cleaning concrete pump size from 1inch-8inch, soft, medium, and ... Brand Schwing, PM, Kyokuto, CIFA, Sany, Zoomlion, and so onTechnical Details for Sponge Ball 1. Soft Type2. Medium Type3. Hard TypeRelative density ... Heat Resistance : + 80 0CCold Resistance : - 40.0C rubber sponge ball for cleaning pipe