Sterling 48" 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. 72121100-0 (SKU 402969), and end walls model No. 72205100-0 (SKU 404887). 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), and 5975-48N-G51 (SKU 452762). Sterling Vikrell fixtures are backed by a 10 year consumer warranty.