These sponges are specially designed for artists and crafters to hold and release the right amount of color for smooth, vibrant results. Developed for use with PanPastel™ Colors (sold separately), these sponges can also be used with most water-based art and craft materials for a variety of unique marks and effects. The round shape allows you to achieve desired results when blending, mark-making, layering and more. Details: Pink Round 4 sponges Nonabrasive Reusable Micro-pore sponge surfaces