rubber sponge cleaning ball size from 1inch-8inch, soft, medium, and hard ... , PM, 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 rubber sponge cleaning ball