... products from the tested products, only goods with no quality problem are allowed to delivery abroad, all sales staff ... requiredcolor: black, yellow quartzite P014, rusty S1120, green, greysurface finish: natural, honed, brushed5. Slate Roofing:thickness—3-3.5,4-6,5 ... have our own quarries and factories, with consistent productivity and quality as well as factory price, the producing capacity is ...