This set includes ten trays in one color made of thick plastic molded to form the most common types of land and water forms: lake, island, gulf, peninsula, strait, isthmus, bay, cape, archipelago and system of lakes.  The trays can be filled with water (use blue food coloring to enhance the exercise) and each has a recessed handle on each side for easier carrying.  They can be stacked neatly one over the other for easy storage. You can also store it in the cabinet for land & water form trays item # G05 A (Sold separately)