Sterling 60" 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. 72131100-0 (443390), and end wall set model No. 72205100-0 (SKU 404887). When used with our wall sets the finished shower unit is 60" 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. 5475-59S-G05 (SKU 443443), 5475-59N-G05 (SKU 443452), 5976-59S (SKU 452735). Sterling Vikrell fixtures are backed by a 10 year consumer warranty.