The Ella Standard, (5-Piece) 60 in. x 36 in. Roll in Shower is manufactured using premium marine grade gel coat fiberglass which creates a smooth, beautiful, long lasting surface with anti-slip textured shower base floor. Ella Standard Barrier Free Shower walls are reinforced with plywood and steel providing flexibility for seat and grab bar installation at needed height for any size bather. The integral self-locking aluminum Pin and Slot System allows the shower walls and the pre-leveled shower base to be conveniently installed from the front. Premium quality material, no need for drywall or extra studs for fixture support, 30 Year Limited Lifetime Warranty (on shower panels) and ease of installation make Ella Barrier Free Showers the best option in the industry for your bathtub replacement or modification needs.