3/16" Acid Free Foam Core
1/16" 4-Ply Acid Free Mat Board
A combination backing board, Bainbridge® foam core is a rigid material to go behind your art as well as a piece of conservation mat 4ply (1/16" thick). Two separate pieces provide excellent protection for fine art framing. The largest size this can be ordered is 40x60. We do not have acid free mats larger than this size.