High-quality sponge clean ball: 1.Texture is soft elastic moderate 2.high resistance to wear 3.good Dirt-remover performance Sponge clean ball:sponge cleaning ball: sponge cleaning ball,4'', 5'' 6'' medium and hard type, cleaning DN125, 150 straight pipes.Sponge cleaning ball: concrete pump spare parts: sponge cleaning ball,4'', 5'' 6'' medium and hard type, cleaning DN125, 150 straight pipes