Sterling 36" x 75-3/4" Ensemble white curved 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. Curved back walls feature 6 built-in shelves for storage. The Sterling curved back walls are for use exclusively with the Sterling Ensemble bases and end walls. For Sterling's curved showers use base model No. 72101100-0 (SKU 402932), end walls model No. 72205100-0 (SKU 404887). When used with our wall sets the finished shower unit is 36" 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. 1500D-36S (SKU 412422), 1505D-36S-G51, 1505D-36S-G52, 2800-34S. Sterling Vikrell fixtures are backed by a 10 year consumer warranty.