Laticrete Hydro Ban Preformed Seats Features Lightweight and durable, easy to transport, handle, and adjust during installation Made from high-density expanded polystyrene with a waterproof finish Hydro Ban Preformed Seats are 100% waterproof and ready-to-tile All LATICRETE Hydro Ban Preformed Seats are 20" (508mm) in height Factory-installed, code-approved waterproofing meets ANSI A1 118.10 requirements Laticrete Hydro Ban Preformed Seats are components of the expanded Hydro Ban line of waterproofing products that allow for high-quality rapid shower installations Ready to tile! Multiple design options and sizes are available, adding utility and value to the shower installation Component of LATICRETE Lifetime Warranty Single source responsibility Works in conjunction with LATICRETE tile and stone installation materials Available Sizes 9301-1616-T: 16" x 16" Triangle 9304-1616-C: 16" x 16" Convex