ECONOMY Crescent Berkshire standard quality 1/16" MAT Backers are pH neutral, but not archival. A cheap alternative to X-board, 2UB or chipboard. An ideal choice when a thin economic mounting method is preferred. You will receive, an assortment of white, off white or antique white standard quality PH neutral mat backer boards. These boards will have an off white core, white core, or combination. The shade of white or combination of whites you receive is dependent on inventory & overstock levels.