Made with 40mil Thick PVC, the SF shower pan liner provides a durable waterproof seal to tile shower bases and other water-concealed waterproofing applications. The liner is premarked with 6" increments on the back for easy measuring and trimming. Including 2 PVC corners for easy to install ready to use, the Dyconn SF shower pan liner comes with 2 pieces of pre-made ready-to-install PVC corners, instead of using glue and making the corner, the included premade corners are a time-saving and leak-free solution. The liner is premarked with 6" increments on the back for easy measuring and trimming.