Ceramics are the most common form of tiles used for most wall and floor tiling situations. They are available in a large number of different sizes, styles and colours. Quarry tiles are made from natural clay. They normally come in a range of earth-tones including reds, browns and black. They are frost proof, which means they are suitable for external use and are often used for paths and steps. Natural stone includes limestone, marble, granite. Because they are made from natural rocks they are more prone to staining, therefore often need greater maintenance to keep them looking at their best. Slates are very durable which make them well suited for use in the kitchen, entrance halls, conservatories, patios and other areas of high traffic. They are available with a riven or smooth surface finish and can be used both internally and externally.