Size Of Frame Outer dimensions: 17.2 X 17.2 Inch / 43.68cm X 43.68cm, Inner dimension: 16 X 16 Inch / 40.64 X 40.64cm. This 16x16 Inch Frame To Without Mat Display 15.5 X 15.5 Inch, With Mats Display 12 X 12 Inch. The actual mat opening was designed slightly smaller than photo itself in order to hold it steadily while not a defect. Important Noted Please Make Sure Tear Off Both Side Film On The Font Of Transparent Protective Sheet(Cover), Pin-Hook Included. Photo frame can fit picture size: 16x16 inch or 12x12 inch, Can Hang the Frames on the Wall of Living Room Baby Room and Stair Case High-Quality Materials The Frame Is Made Of Solid Wood(Wood Grain), That Is Different From The One Made Of Ps Or Mdf. It'S More Durable And Free From The Change Of Humidity And Temperature.