... 11,11-13MM Nature Stone Roofing Slate of Black Sheets 1.Natural finish.a little bit rough surfacenice ... size acceptcolor: black,white,rusty S1120,yellow quartzite P014,green,grey,sesame yellow,pink,mixed color,multicolormaterial: slate, quartzite ... customized size acceptcolor: black, yellow quartzite P014, rusty S1120, green, greysurface finish: natural, honed, brushed3. Step/Stairs:thickness—20 ...