18×18 Photo Frame Matted For 18×18 Artwork or 20×20 Art Print Without Photo Mat. The included White picture matte is Acid-Free to protect your prints, pictures, posters, photos, fotos, or puzzle. This White frame is constructed from pine wood. Great for your walls decor, boho theme, canvas art, kitchen art, rustic art, livingroom art, neutral theme, painting, drawing, industrial, mirror art. Each frame includes UV resistant, shatter guard, frame grade acrylic, in place of standard glass. Acid-free white foam board backing and metal hanging hardware are also included. Great for collages! Easily assemble your own gallery wall frame set or wood frames collage by combining several black, white, silver, or natural frames to create your own wooden frame wall grid. Add to your home aesthetic wall decor with our custom square picture frames.