The opening size is 11.5"x15.5" for 12x16 print + conservation backing board

Conservation matboard is and alfa cellulose matboard made of pristine virgin fibres. It is acid-free and lignin-free with consistent color, fade and bleed resistance.
4 ply Thickness (.050-.060)
All Mats are cut at a 45 Degree Bevel.
Backing is using the same conservation mat board.
It is best used for original artwork, limited editions, and other valuable or valued artworks.

Quantity 1 = 10 mats and 10 backing.

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