Sterling 48" x 75-3/4" Ensemble white simulated tile shower back walls are made of Sterling's exclusive Vikrell material with high-gloss finish. Vikrell is a sheet molded compound that is solid color throughout, and stronger than fiberglass. Simulated tile back walls feature 6 built-in shelves for storage. The Sterling simulated tile back walls are for use exclusively with the Sterling Ensemble bases and end walls. For Sterling's simulated tile showers use base model No. 72121100-0 (SKU 402969), end walls model No. 72105100-0 (SKU 443381). When used with our wall sets the finished shower unit is 48" x 34" x 75-3/4" tall. Sterling Vikrell shower systems assemble with a tongue and groove system that minimizes the need for caulk. Use Sterling doors Model No. 5475-48S-G05 (SKU 443416), 5475-48N-G05 (SKU 443434), 5976-48S (SKU 446904), 5975-48N-G06 (SKU 447485), 5975-48N-G51 (SKU 452762). Sterling Vikrell fixtures are backed by a 10 year consumer warranty.