This set is ideal for beginners and professionals alike. The lid has two removable clip on palettes that will give you 16 mixing wells. The inside of the lid can also be used as an additional mixing area. There are six cartridges that hold a total of 24 watercolor half pans. These cartridges will also hold full pans and they will snap into any Cotman set. The inside of the box has an empty space so you can add more paint or small supplies. Also included is a number 3 Cotman watercolor brush. Great for use in the studio or out in the field!