... in it more than ten years. High quality roofing slate. All of our roofing slate confirms the standard of BS680, ASTM C406 ... , heat-resistance and antifreeze, it is widely used in outdoor roofing, paver, and cladding. Size is: 400x250, 400x300, 400x200, 500x250, 600x300 ... , 6mm, 7mm, 8mm, 10mm or as per client's requirementColor: Green, Grey, Dark Grey, Grey Black,Black, Blue Black, Rusty.Packing ...