USED IN ART133, HOLLY SHU KIN SO WHITE CORE mat board provides the aesthetic and design benefits of a bright, stay-white core with the affordability of a cream core mat board. These Economy mat boards are made by Crescent Cardboard, the premier producer of mat board in the USA. All ECONOMY boards have buffered acid free surface, core and backing papers which add protection and longevity. ECONOMY boards are suitable for most everyday needs including the non-conservation framing of: posters, art prints, craft projects, school projects, amateur and professional photos.