Sponge Brush Set Ca-904 ( 4 Pieces ) These sponge brushes are made of water-absorbing sponge and the handle is made of wood, which is light in weight, so it is easy and comfortable to handle. The round ended design makes these perfect for painting circles and dots of different sizes. They are also wonderful to use with stencils and in many other DIY craft projects, including cardmaking, scrap booking and so much more!