Vikrell is equivalent to acrylic but lighter in weight. Another model is the Autofill Bath System, which is in kit form. It is offered at a low price. It is a control module that allows the user to preset the tub filling time as much as 24 hours in advance. The kit can be fitted to any tub or whirlpool that uses Kohlers drain mechanism.
Colours vary between companies.
Kohler now offers eighteen colours with new ones added all the time. The most popular are still white, almond and grey.