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) 8x28 Frame. BulletPoint3 : This mat will fit a 4x24 Photo. Actual opening size will be 3.75x23.75. 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 : Smooth Black CornerStyle : Pleated CustomerPackageType : Standard Packaging FinishType : Matte ItemDisplayDimensions_Height : 8 inches ItemDisplayDimensions_Length : 28 inches ItemDisplayDimensions_Width : 28 inches ItemDisplayWeight : 1 pounds ItemName : ArtToFrames MAT-21-8x28-Black 8x28 Smooth Black Custom Mat ItemPackageDimensions_Height : 8 inches ItemPackageDimensions_Length : 28 inches ItemPackageDimensions_Width : 28 inches ItemPackageQuantity : 1 ItemShape : Oblong ItemTypeKeyword : photo-mat-boards Manufacturer : ArtToFrames Material : paper ModelName : MAT-21-21x30-Black ModelNumber : MAT-21-8x28-Black NumberOfItems : 1 OccasionType1 : Mother's Day OccasionType2 : Grandparents Day OccasionType3 : Retirement PartNumber : MAT-21-8x28-Black ProductSiteLaunchDate : 2011-11-30T21:59:37.018Z Size : 8x28 StreetDate : 2017-03-25T00:00:01Z Style : Customized SurfaceRecommendation : Hard Floor TargetAudience : Unisex Adult UnitCount : 1