The opening size is 3.5"x5.5" for 4x6 print + conservation backing board + clear bag

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 = 20 mats, 20 backing and 20 bags

(Free Shipping available for continental US only. For PR, Alaska, Hawaii, APO and FPO please email us first)