The Black Interlocking Rubber Gym Flooring is made from recycled rubber and bond with urethane binder which encapsulates each piece of rubber for long life and provides resistance to foreign substances. Each piece is 3/8" thick and has a dimension of 19.5" square once tabs are trimmed and two pieces snapped together measure 39". The mats are packaged 4 to a set leaving you a 39" x 39" covered area. This is equivalent to 10.56 square feet. The Super Lock Flooring System offers an interlocking rubber floor system that 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! Available in solid black or black with gray specks.