china newstar stone(vct factory) can export slate building material products,the surface is available for tumbled slate,meshed slate,mushroom slate,nature slate,culture slate,chishlled slate,hone slate,polishing slate,etc.the nature slate and hone slate is more suit for roofing tile. the size of roofing slate tiles thickness: 5-7mm, 6-7mm, 7-10mm size: 10x20cm, 20x30cm, 20x40cm, 25x40cm, 25x50cm, 60x30cm. and other size available. more information,welcome to contact me! www.stoneowner.com