Arty & Rainbow Cake Palette Foam Insert with AdhesiveThe Pro Essentials Palette Foam Insert holds (4) Arty Brush and has (8) holes that fit the Silly Farm Rainbow Cake paints securely in a high density easy to clean charcoal colored poly foam. This insert fits into the empty Professional palettes which are sold separately. Important Note: If you purchase a Pro Essential Palette a foam insert is already included with the palette, some people prefer to purchase an extra insert as a backup or to replace an