50 of black 8x10 conservation whitecore mat,fits 5x7 +back+bag 50 of Black 8x10 conservation whitecore mat,fits 5x7 +back+bag This item comes with 50 single mats, 50 backing, and 50 bags. The opening size is 4.5"x6.5" for 5x7 print The mats are beveled cut with white core and 4-ply thick (about 1.4 mm or 1/16 inch). Please Unwrap the plastic wrap & Flip the first mat over to see the actual color mat.