Get this Sumauma Underlayment Plywood for delivery. Stable, moisture controlled panel. 5mm thick by 4-ft x 8-ft. Three ply. For use with all types of floor coverings. For use in kitchens, bathrooms and laundry rooms. Great for shelving, cabinetry, underlayment, paneling, furniture, mill work and more. Lightweight, yet very strong. Exterior resins used makes these water resistant and suitable for exterior use.