Specification Brand : ArtToFrames BulletPoint1 : Mat is standard 4 ply material used in Custom Frame shops. BulletPoint2 : Made of lignin-free and pH-neutral materials. Fits into a(n) 20x28 Frame. BulletPoint3 : This mat will fit a 16x24 Photo. Actual opening size will be 15.75x23.75. BulletPoint4 : NOTE FOR ORDERS SOLD BY ArtToFrames ONLY: OPENING SIZE(s) MAY BE CHANGED BY CUSTOMER. Please include your desired opening size(s) by email, or through the contact seller link. If we do not receive a request for a custom size within 2 hours of your order it will be cut with the opening size listed above. Feel free to contact us with any questions you may have. Color : Splash ItemDisplayDimensions_Height : 20 inches ItemDisplayDimensions_Length : 28 inches ItemDisplayDimensions_Width : 28 inches ItemDisplayWeight : 1 pounds ItemName : 20x28 Splash / Nile Green Custom Mat for Picture Frame with 16x24 opening size (Mat Only, Frame NOT Included) ItemPackageDimensions_Height : 20 inches ItemPackageDimensions_Length : 28 inches ItemPackageDimensions_Width : 28 inches ItemPackageQuantity : 1 ItemShape : Rectangular ItemTypeKeyword : photo-mat-boards Manufacturer : ArtToFrames Material : Paper ModelName : MAT-209-20x28-Nile Green ModelNumber : MAT-209-20x28-Nile Green NumberOfItems : 1 PartNumber : MAT-209-20x28-Nile Green ProductSiteLaunchDate : 2015-11-12T20:14:48.297Z Size : 20x28 StreetDate : 2017-03-27T00:00:01Z Style : Custom mat UnitCount : 1