The Masterson Handy Palette Refill Sponge is designed for use with the Masterson Sta-Wet Handy Palette. This proprietary sponge keeps acrylics and other water-soluble paints moist and workable for days, even weeks. Use this sponge in combination with Masterson Sta-Wet Acrylic Paper (not included) to provide moisture to the paints. This Masterson Refill Pack contains one sponge. Please be sure to follow all sponge preparation directions provided. Made in the United States.