Roofing Slate Black Sheets 1.Passed ASTM&BS680 2.Size 400*200,400*250,500*250,600*300mm 3.Thick 5-7,6-8,7-9,8-10,9-11,11-13MM Nature Stone Roofing Slate of Black Sheets 1.Natural finish.a little bit rough surfacenice colornon-fadingdurable2.Regular size:400*200,400*250,500*250,305*305,300*300,300*600Regular thickness: 4-6,5-7,6-8,7-9,8-10,9-11,11-13mmOr as customer requireAvailable shapes: Square ...