Custom Double Mat Board | Mat Boards Cut to Size | Acid-Free | 50+ ColorsCustom Double Mat Board Cut to Size Acid Free Conservation Matboard Enhance your artwork, photographs, and prints with a custom double mat board cut to your exact specifications. Each mat board is precision cut with your custom opening size and outside dimensions to create a clean, professional presentation for framing. Double matting layers two mat boards together so that a second color appears as a subtle accent border around your artwork. This