SL4U SMC Solid Shower Base, Center Shower Drain Included, 32'D x 48'W x 4'H Shower Tray Base, White | sl4uonline
SUNNY 60" L x 36" W x 4" H Shower Base Pans Anti-slip with Cover Center Drain | eBay
Amazon.com: Shower Grip Anti-Slip Coating for Bathtub & Shower Floors – Refinish and Increase The Slip Resistance on Tubs and Shower Trays – White : Home & Kitchen
Lakes Traditional Rectangular Stone Resin Deep Shower Tray 900mm x 760mm