Sterling 36" x 75-3/4" Ensemble white curved shower end 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. The Sterling curved end walls are for use exclusively with the Sterling Ensemble bases and end walls. For 36" wide showers use back wall Model No. 72202100-0 (SKU 402950), and base model No. 72101100-0 (SKU 402932), for 48" wide showers use back wall model No. 72222100-0 (SKU 402978) and base model No. 72121100-0 (SKU 402969), for 60" wide showers use back wall Model No. 72232100-0 (SKU 443791)and base Model No. 72131100-0(SKU 443791). When used with our wall sets the finished shower unit is 75-3/4" tall. Sterling Vikrell shower systems assemble with a tongue and groove system that minimizes the need for caulk. Sterling Vikrell fixtures are backed by a 10 year consumer warranty.