White thermoplastic deluxe walls. Fits alcoves up to 60" W. x 40" D. 5-piece construction, 6 large molded-in self-draining shelves. Easily adhesive-mounts to drywall or like surface. Mold and mildew-resistant, and easy-to-clean. Installs onto existing shower base, or match with a Mustee Durabase shower base, Model No. 3060L, (SKU 412075) or 3060R, (SKU 412093).