About this item 10 of 18×24 White Pre-cut Acid-free whitecore mat for 12×18 back bag This item comes with 10 single mats, 10 backing, and 10 bags. The opening size is 11.5″x17.5″ for 12×18 print backing board clear bag The mats are beveled cut with white core and 4-ply thick (about 1.4 mm or 1/16 inch).
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