The Mustee, E. L. & Sons, Inc. 36 in. x 36 in. Single-Threshold Shower Floor in Bone has a slip-resistant floor surface with a ribbed, molded-fiberglass underbody for extra strength. The semi-gloss surface resists mold and mildew and is easy to clean. It has an integral molded drain and is compatible for use with the Mustee Durawall shower wall, ceramic-tile walls or pre-formed wall kits.