BLVCK™ Slate Macbook in the black stone case is handmade from a natural black slate. 100% premium real slate. Each cover is engineered with a combination of passion and design. Due to the varying nature of the stone, each cover will be unique to the individual (please note the product is gray and carries darker shades of grey and light red stone as well). BLVCK™ Slate Macbook offers additional protection with the bottom cover.