Amazon.com: 12x16 Smooth Black / Black Custom Mat for Picture Frame with 8x12 opening size (Mat Only, Frame NOT Included) : Electronics
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ArtToFrames 9x11" Off White Custom Mat for Picture Frame with Opening for 5x7" Photos. Mat Only, Frame Not Included (MAT-182) - Walmart.com
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Amazon.com: 7x16 Off White Custom Mat for Picture Frame with 3x12 Opening Size : Electronics
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ArtToFrames 12x13" White Custom Mat for Picture Frame with Opening for 8x9" Photos. Mat Only, Frame Not Included (MAT-241) - Walmart.com
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The Framer's Workshop, Berkeley, CA 94704 Custom Cut Acid-Free Photo Name Mats and Specialty Custom Cut Shaped Mats