... bags 2.Colour:Black 3.Size:3-5mm 4.USD140-180/MT 5.Natrual mine Size:1-3mm,3-5mm,5-7mm,7-10mm ... ,5-10mm;1-2cm,2-4cm,3-5cm,4-8cm,5- ... -base resisting7.Non-pollution and no radioactivity, environment protection 3.Physical properties: Volume-weight(kg/m3)430-870Water absorption11. ... by real products:Alibaba Certificate:My Mobile: 86 13722996216 3-5mm Pumice Stone