Lineco Basics 4-Ply Full-Size Buffered 100% Rag Gallery Mat Board (25 Sheets, 32 x 40", Black)

They have taken the most popular colors of their 100% cotton rag mat board and made it available at the lowest price imaginable. And they didn't skimp on quality. This board is made with 100% cotton fibers, with solid color throughout. The 4 ply construction is buffered with 3% calcium carbonate and is acid-free and lignin-free - everything you want in a mat board.