Tsingtao SG Stone Co.,Ltd have set up several workshop at the slate quarry where can produce high quality slate can fabricate the roofing tiles. each single pieces have strict examed by our experienced person from our quality control department. most of roofing slate passed BS680 standard, ASTM-S1,and EN12326. Water absorption,Modulus of Rupture,and weather resistant all character in high quality. There are 4 species of china roofing slate available fromu our slate range , Species:Black color roofing slate,Grey color roofing slate, Rusty yellow roofing slate, green color roofing slate, the design can be cut to various .variouis designs,square,round and other design please check three to view our design , we also custom made base on your design.