These mini canvases are 100% acid free cotton. Each canvas is triple primed with a medium grain. They are suitable for any type of paint. They measure 4” x 4”. These are good for school projects or home projects and you can display your unique creation on any surface that holds a magnet. North Shore has a wide variety of canvases in many different sizes. Use North Shore paint and paint brushes to create a small and sweet portrait or landscape. They're the perfect size for small projects, gifts, signs and more.