The Body Solid Interlocking Rubber Flooring comes with 4 pieces. Each square has a dimension of 19.5". Once tabs are trimmed and two pieces are snapped together, it then measures 39". This item comes in solid black with gray specs. Its made from recycled rubber and bond with urethane binder which encapsulates each piece of rubber for long life and provides resistance to foreign substances. The interlocking rubber floor system consists of a single design piece that can be trimmed easily with a straight edge and carpenter's knife making it easy to adjust the size of your workout area and still have a professional rubber floor system.