The contents of a picture frame - including the glass/mountboard/artwork/backing board
frame backing UK Picture Framing Supplies Blog
What are Picture Frame Spacers & Why Do You Need Them?
Top 8 Picture Framing Problems — Solved - Frame Destination
Blog Tuft the World
Mat Board Type Guide
Cut to Size Picture Frame Backing Board & Fastmount
Backing Board Sample Sheets LION Picture Framing Supplies Ltd
frame backing UK Picture Framing Supplies Blog
Backing Board Sample Sheets LION Picture Framing Supplies Ltd