The Kaldera 56 is a simple rectangular basin designed to match the Kaldera built-in bathtub collection. Suitable for undermount installation, the Kaldera 56 features an internal overflow and is also available in a larger size - see Kaldera 62. Crafted from the trademark Victoria + Albert QUARRYCAST® material, composed of volcanic limestone and high performance resins formed from a single casting, making it harder and more durable than acrylic basins. QUARRYCAST® is warm to the touch, highly insulated, strong, very easy to care for and guaranteed for 25 years.