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) 12x18 Frame. BulletPoint3 : This mat will fit a 8x14 Photo. Actual opening size will be 7.75x13.75. BulletPoint4 : NOTE FOR ORDERS SOLD BY ArtToFrames ONLY: OPENING SIZE(s) MAY BE CHANGED BY CUSTOMER. Please reach out to us with your desired opening size. 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 : Granite - 6 Pack ItemDisplayDimensions_Length : 18 inches ItemDisplayDimensions_Width : 12 inches ItemDisplayWeight : 0.19 pounds ItemName : 12x18 Granite/Mountain Grey Custom Mat for Picture Frame with 8x14 Opening Size (Mat Only, Frame NOT Included) - 6 Pack ItemPackageDimensions_Height : 5 inches ItemPackageDimensions_Length : 23 inches ItemPackageDimensions_Width : 20 inches ItemTypeKeyword : photo-mat-boards Manufacturer : ArtToFrames Material : 4-Ply Acid Free Cardboard NumberOfItems : 6 PartNumber : Pack_6_MAT-152-12x18 ProductDescription : Fits a 12x18 Frame, and a Photo 8x14. For custom cuts and designs please reference !~Product SKU # - - Pack_6_MAT-152-12x18~\ ProductSiteLaunchDate : 2024-03-15T22:42:13.811Z Size : 12x18