red color sand for waterproof 1 technic: natural or artifical 2 material: High quality natural stone 3 color :more red color sand for ... ,blue, green, red ,pink ,and so on 3. size(mesh):5-10 10-20 20-40 40-80 80-120 0 ... 1-3mm 2-4mm and so on 4 .technic:natural or artifical 5.variety: natural colored sand,, dye colored sand , decorative colored sand ...