Specially designed for use with Acrylics, as the patented Sta-Wet palette paper and sponge (5 sheets and 1 sponge included) allows the paint to slowly absorb water and stay wet for hours while the palette is open. When closed, the lid keeps paints clean and moist for days, even weeks! For use with Watercolours, move the paper and sponge and use all the wells and mixing areas to work with your paints. For use with Oils, remove the acrylic paper and sponge and insert your favourite oil palette paper (not included). The lid will keep your paints clean and retard drying.