Sterling 60" x 72-1/2" 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, and end wall set, see Related Items. When used with our wall sets the finished shower unit is 60" x 34" x 72-1/2" tall. Sterling Vikrell shower systems assemble with a tongue and groove system that minimizes the need for caulk. Also see Related Items for Sterling shower doors. Sterling Vikrell fixtures are backed by a 10 year consumer warranty.