... ,SGS 5.rough edge,split surface Rectangle natural black roofing slate with two holes Optional color: Black, grey, green, ... sides natural Features: 1. Suitable for roofing decoration; 2. Slate With low water absorption, easy installation, good acid resistance, efflorescence ... -resistance and antifreeze, it is widely used in outdoor roofing, paver, and cladding. 3.Size: 30X20CM, 20x60cm, 30x60cm,40x40cm, ...