Fortress Fortress 189348161 Ff Evolution 48-in Stair Tray

11-in x 48-in stair system tray that fits over the stair stringers. Designed for low-maintenance, durability, ease of installation and safety. Looks and installs like wood. A noncombustible material, resistant to fire and invulnerable to rotting, warping, splitting and pesky insect damage. Steel is recycled and recyclable, making it more sustainable than wood. Carries a 25-year limited manufacturer warranty.