This is a medium size water basin with a brush cleaning end shaped into the top. This allows you to work the brush as you clean out the water or for Chinese brushes it allows you to work the brush into shape as it is being cleaned. Measuring 7” in diameter it is a world wide favorite for watercolorists and artists using thinned acrylics. Many artists like to buy several for various reasons including separating dark and light colored water and creating a cleaning team of dirty water, secondary water and finishing water.