Amazon.com: Mat Board Center, Acid-Free Pre-Cut 16x20 Picture Mat Set. Includes a Pack of White Core Bevel Cut Mattes for 11x14 Photos, Backers & Clear Bags (White, 5-Pack)
11x14 Picture Mats For 8x10 Photos
Pacon Pre-Cut Mat Frames | MisterArt.com
11x14 Pre-cut Mat with Whitecore fits 8x10 Picture | Golden State Art
Pre-Cut Beveled Mats For Many Photo Sizes
Pack of 25, 11x14 Pre-cut Mat with Whitecore fits 8x10 Picture + Backing + Bags. | Golden State Art