1. Natural imperial black and grey 2. Easy to install, no radiation 3. ... 10 years experience 4. Flat slate roof tiles The natural imperial black & grey flat slate roof tiles also could be used ... -15 / 15-20 / 17-22 / 20-25 / 20-30 Color Imperial Black, Rusty, Gray, Green, etc. Sample Available Packing Wooden Crate ...