Product DescriptionSynthetic Hydra Sponge Synthetic Hydra Sponge 2.75": This sponge is ideal to use for sponge painting, faux finishes, stippling, staining. This professional artist sponges can be used with acrylics, oils, watercolors and fabric paints or dyes. Always rinse before using, squeezing out excess water. Never allow paint to dry in sponge. These sponges are designed to simulate a natural sea sponge, with the same traditional effects. 1 sponge per package.