About Neptune 10.10925.0000.10 Believe BE3666 66" Customizable Drop-In Rectangular Bathtub. The Classic beauty and quality unite in the Neptune Believe Bathtub. The rectangular profile of this drop-in bathtub offers a spacious interior that is both, ergonomic and comfortable. High quality acrylic material requires minimal maintenance and comes in one of the six beautiful finishes to create a custom look in your bathroom. Enjoy all the therapeutic benefits of this model by selecting an optional jet mode system and adding chromotherapy lights and Rayola heated backrests. With traditional styling and multiple choice of innovative features this elegant bathtub is an ideal solution for your master bathroom makeover.