- C20 contour has straight edges. It can be installed as a drop-in or as an alcove.
- C21 contour is more rounded outward and convex. It can be installed for drop-in only.
- C22 contour is concaved towards the inside of the tub and the outside edges are straighter, more of a rectangular shape. It can only be installed as a drop-in.
- C23a and C23b contours : "a" has its overflow on the wider lip, whereas "b" has it on the thinner lip. They both have the same drain location.
- C24 contour is only available for undermount installation.
