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Smooth White 12x18 White Picture Mats with White Core for 11x14 Pictures - Fits 12x18 Frame - Walmart.com
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ArtToFrames 12x18" Black Custom Mat for Picture Frame with Opening for 8x14" Photos. Mat Only, Frame Not Included (MAT-21) - Walmart.com
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Amazon.com: Mat Board Center, Pack of 20 12x18 Uncut Photo Mats, White Backing Boards - for Photos, Prints, Frames and More
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