Mostly made from limestone, sandstone or slate. Flagstone is a flat stone generally used for landscaping or veneering. Thickness can range from 1/2 to 3 inches. Sizes of pieces range greatly from hand-sized to full slabs. Flagstone is available random, in cut patterns or customized sizes. Working very closely with each stone quarry, both domestic and internationally, SBI Materials is able to craft the most unique look by taking into account the color tones and appropriate application type to match any project.