Bathtubs come in so many shapes, sizes, colors, and types that you are sure to find what you are looking for. Most of bathtubs are made of fiberglass, coated cast iron, and solid acrylic. Fiberglass bathtubs are extremely popular units and least expensive. But this bathtubs have disadvantages, such as need sufficient support in the beneath of units during installation to prevent the fiberglass floor from cracked.
Cast iron bathtub is the more durable. It retains heat better than steel and is much quieter when it's being filled. They also are the heaviest and most difficult to install.