... 3cm to 10-100cm; natural stone,non-polluting; 3,000mt/month ISO9001-2000 certified company Pumice Character,1 ... Light in weight, high in hardness;2), Natural stone,non-polluting, non-radioactive;3), Acid resistance, Corrosion resistance;4 ... in garden or yard as a beautiful scenery.3), Textile: As one kind of friction material ... mixed black and white mixed gray).Size:2-3MM,5-10MM,10-15MM,30-50MM,50-80MM, ...