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Mat Board Center, Double Mat - Acid Free, 8-ply Thickness, White Core - for Pictures, Photos, Framing (White Over Black, 16x20 for 11x14, Pack of 5) : Amazon.co.uk: Home & Kitchen
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Golden State Art,16x20 Pre-cut Double Mat with Whitecore fits 11x14 Picture | Golden State Art
Amazon.com: 16x20 Black & White Double Picture Mat, Bevel Cut for 12x16 Picture or Photo : Electronics
Amazon.com: 16x20 Black & White Double Picture Mat, for 2 8x10 Pictures : Electronics
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Picture Frame Double Mat 16x20 for 11x14 photo Red with Black liner 1x3 | eBay
Amazon.com: 16x20 Patriotic Triple Picture Mat, Bevel Cut for 11x14 Picture or Photo : Electronics