18x24 Pre-cut Mat with Whitecore fits 12x18 Picture + Backing + Bags

Pack of 25 sets of 11x14 for 8x10 Photo White Mat Matte Board with Bac – Prophotographygear

5x7 Pre-cut Mat with Whitecore fits 4x6 Picture + Backing + Bags

MATBOARDOULET

Easy Way to Mount a Poster with Mat Board Yourself - ReStyleGraphic

This item comes with 10 single mats, 10 backing, and 10 bags. The opening size is 11.5x17.5 for 12x18 print + backing board + clear bag The mats are

10 of 18x24 White Pre-cut Acid-free whitecore mat for 12x18 + back+bag

5x7 Economy Single Photo Mat

Double Mats : 20X30 For 18X24 Artwork

Pack of 50, 8x10 Pre-cut Mat with Whitecore fits 5x7 Picture + Backing + Bags.

Pre-Cut Mat Board Show Kit White Core in Smooth White, Backs, Clear Bags