aking natural iron ore and high-grade enamel powder as raw material, cast iron bathtubs SW-013 are made on a production line combining traditional skills and modern technology, shaped elegantly and delicately with fluent flowing curves and flat surface; the products are covered with first-grade enamels which would remain spotlessly white as when new; the high-quality enamel coat not only feels smooth and pleasing in the surface but also are designed in accordance with your back line to comfort you the most; Comparing to its like products, Sharking cast iron bathtubs SW-013 do not contain radio-elements or poisonous materials but multiple kinds of minerals and nutrients, which can aid your blood circulation and improve your health. Besides, the bathtubs also have long working life, good heat preservation, excellent resistance to acid and alkali and easy-washing to stains