... gloosy and smooth, 2.the bottom is groove. 3.Waterproof, 4fire retantance pvc sandwich panel 1)Fetures:wearing resistance,waterproof,flame retarding ... :light in weight and easy to install.3)Width:10cm,16cm,20cm,25cm4)Thickness:5.5mm,6.0mm,7.5mm,8.5mm ... ,9.0mm5)PVC%:40%,45%,50%6)Surface: common ...