... 1.material:good quality natural rubber 2.density: medium and hard 3.size:10-170 4 withstand high temperature Standard sponge ... hardness settlings of the copper pipe,steel pipe,Titanium tube,etc.Technial data Sponge Ball Technological Data SheetMaterialNatural RubberLongevityExtended ... available with acids, alkalis, oils, fats and solvents. High quality rubber sponge cleaning ball for pipeline cleaning