These gesso panels feature a 1/8" raised lip which is part of the frame around the panel itself. The natural wood can be left as-is or stained and painted for frameless presentations. Use with Fluid Acrylics, High Flow Acrylics, Glazing liquids, Pouring Mediums, Encaustics, Pebeo Resin Paints and Alcohol-based dyes. Available in several sizes, with a choice of 3/4" or 1.5" depth.