rubber sponge cleaning ball size from 1inch-8inch, soft, medium, and hard available NameConcrete ... , Kyokuto, CIFA, Sany, Zoomlion, and so onTechnical Details for Sponge Ball 1. Soft Type2. Medium Type3. Hard TypeRelative density:0.16 ... – 63kN / m2Colour : Orange Heat Resistance : + 80 0CCold Resistance : - 40.0C rubber sponge cleaning ball