This is a set of a two round brushes, Size 5 and Size 8, which are from the Richeson 9000 Series
Watercolor Round Brush set. These brushes are perfect for a wide range of different artistic uses including watercolor works, casein and acrylic works. They are built to withstand a long duration of use, and they are very high in quality and easy to work with. The fibers in the brush are composed of seven different types of synthetic filaments, and the resulting brush is one that is very durable and one that can hold a large volume of paint.