This is a reusable paint brush that enables the user to quickly experiment with different bristle materials. You can use any natural fibers, cloth or paper as the bristle material. Just simply thread the chosen material through the handle and pass the ferrule over the end to clamp it down. When done, the brush can be reused by undoing the ferrule and removing the bristle material. Can also be used for cooking. Save money on paint brushes. Use up your old clothes. Designed to be able to be printed on smaller desktop 3D printers as well. Prior to using, it is recommended to trim your bristles to the desired shape and get rid of any loose materials.