Black Slate Roof 1.size:40*20,40*25, ... square,triangle,U shape Roofing slate, roof slate, natural slate, slate roof, black roof slate, roofing tiles, cheap slate, nature slate, slate roofing, slate roof,black slate. Features and specifications:Edgechipped ... etcholewith drilled hole,w/o hole Natural roofing slate is with beautiful natural venations,headline your house. Black Slate Roofing Square Shape