These watercolor cases are excellent for the on-the-go artists! With excellent quality and convenient portability, this set is a great value. Twenty-four brilliant pans of watercolors are neatly stacked in four interlocking trays. The trays are topped with a clear plastic lid that can also be used as a mixing tray. Each tray measures 3-1/4" in diameter. The individual watercolor pans are each 7/8" in diameter.