3-5 mm Pumice stone 1-3cm to 10-100cm; natural stone, ... Corrosion resistance;4), An ideal natural, green, environmentally friendly products.5), Hole rate: 60%Min.Application:Widely used in architecture(construction ... white.(Normally brown mixed black and white mixed gray).Size:2-3MM,5-10MM,10-15MM,30-50MM,50-80MM,80-100MM ... according customer's request.Shipping: By container or truck 3-5 mm Pumice stone