Grey Slate Riven Pavers are a consistent type of aged stone flooring. It has a natural riven surface and an edge. It is a traditional slate flagstone which is commonly laid with a wide grout line to give the appearance of aged natural stone flooring. It is available in flagstone sizes. It is frost resistant. Grey Slate Riven Pavers have a non slip surface and therefore are an ideal type of natural stone flooring to use externally.