This is Conservation (Archival) Matboard, fully customized, available in 56 colors. You decide: Outer Mat Size, Opening Size, Color. 
BEST PRICE/QUALITY ratio guaranteed with even better prices than regular, non archival mats. 

HOW TO ORDER: 
Choose Outside Mat Dimensions option listed that your Outside mat board size will fit into, example: If your mat size is 8x12" choose " Over 8x10 to 11x14", next choose Quantity. 

Let me know : color name ( look at color chart pic.#2), outside mat size, opening size (make sure matte opening is smaller than your artwork so it does not fall through!). Mat opening should be 0.5" smaller in each direction of your print to provide some overlap. Example: for print 8x10" opening is 7.5x9.5". Mat will be cut to exact size provided.

 If you need double mat, add to cart 2 mats, let me know top/ bottom color. Standard reveal of bottom mat is 1/4".

IMPORTANT: Only Conservation mats or Cotton Mats are archival. Regular acid free mats can destroy your artwork within 10 years. Acid free doesn`t mean it is safe, important is core material.
 
MATBOARD DETAILS: 

4 PLY- 1/16" Thick
White Core
56 Colors to choose from
45 degree beveled edge cutout