Acrylic Smooth and glossy – Easy to clean with no grout lines to maintain Built-in storage – Six generous shelves are 4 ½-in. deep, roomy enough to hold extra-large bottles Interlocking design – Tongue and groove construction prevents water seepage Three-piece system – Includes two side walls and one back wall Strong and durable – Impact resistant polystyrene material Complements Studio Bathtub – For use with models 2946.102 or 2946.202, sold separately Limited lifetime warranty – Buy with confidence