If you want a 17x22 mat you would select a 18x24 mat size.
Backing boards 8 5 x 11 mat.
Our 8 5x11 mat boards are.
White the mats are beveled cut with white core and 4 ply thick about 1 4 mm or 1 16 inch the backing is white on both side.
The opening size is 7 5 x9 5 for 8x10 print.
Buy archival methods conservation mat board 8 5 x 11 2 ply pearl white package of 25.
8 5 x 11 backing board quality wholesale backing board for photos art and paper.
1 16 4 ply thick and sturdy enough to withstand the awesomeness of your artwork.
By mounting your artwork on a backing board beforehand you prevent your artwork from warping.
Bevel cut to give your photo a professional finish.
These backing boards are acid free on both surfaces but not in the middle which is made of chipboard.
Example if you want a custom size mat of 11x15 you would select a 12x16 mat size.
Either thicker 4 ply mat board with 1 16 or 0 0625 thickness or 8 ply mat board with 1 8 or 0 125 thickness.
Simply select the larger mat size and then in the special instructions box type in the outside dimensions that you want.
Set of 25 pieces of 11x14 picture mats for 8x10 photo with backing boards and bags this item comes with the 25 pre cut mats 25 backing boards and 25 clear bags.
Example cut mat to 17x22 or od 17x22.
These traditional letter size photos need to stay as flat as possible whether they re being put in sleeves placed on frames connected to mats or something else.