Watercolor brushes are specialized tools designed for painting with watercolors. They come in various shapes and sizes, including round, flat, and filbert, each serving different techniques and effects. The bristles can be made from natural hair, like sable or hog, or synthetic materials, offering different levels of absorbency and flexibility. These brushes are typically used with watercolor paints on watercolor paper. The softness of the bristles allows for smooth application and blending of colors, making them ideal for creating washes and fine details. Proper care, such as cleaning and reshaping the bristles, helps maintain their performance and longevity.