Vallejo: Wet Palette Reusable Hydration Sponges 2ct

Made of PVA, it has the necessary thickness to ensure moisture retention for long periods of time, maintaining an adequate water reserve without oversaturating the paper. It is designed to be reusable and easy to clean. 

High density PVA foam, 3 mm thick, which provides an excellent absorption capability. White color ensures accurate color perception when using translucent papers.