Fiberglass. Slip resistant floor. Simulated tile walls. Molded soap ledges. 2 Molded seats 7"W x 18 1/2"D x 20 1/2"H. Above the floor rough. Center drain. Complies with NAHB, HUD UM-73A, & ANSI-Z124.1.2. 6 year warranty. 8.5" Threshold.