These boards are really just layers of paper or pulp that is rolled together with adhesive to make a thicker paper. Fom-Cor, also known as foam board, is a very popular for modeling and framing. Choose from brands you trust such as Crescent, Bienfang, Strathmore, Letramax & Nielsen-Bainbridge.
Matboard, Pre Cut Photo Mats
White Foam Board (Standard Sizes) - Columbia Omni Studio
DIY photo mounting for a cheap + easy gallery wall - It's Always Autumn
Buy 1/16 Illustration board for artist projects Graphic Lab Printing
What is a Mat Board?
How to Add Glass and Art to a Picture Frame - FineWoodworking
Art board
Custom Canvas Foam Board Printing
Pack of 10, 16x20 Self Adhesive Foamboard for Picture and Poster Mounting, Light
Mounting, Matting, and Framing
Bainbridge Graphic and Mount Boards – Nielsen Bainbridge
Foam Core Mounting 101 Learn How to Do Foam Board Mounting Like a Pro