[High-Quality Materials & Durable]: This photo frame mat is made of high-quality paper material, featuring environmentally friendly properties, resistance to deformation, anti-aging, and durable construction. Designed to be acid-free, it ensures safe use and does not produce any harmful substances. [Standard A3 Size & DIY Design]: The outer size of this photo frame mat is 29.7 x 42 cm (11.69 x 16.54 inches), making it suitable for A4 size pictures. The white color allows for easy customization, enabling you to create a unique frame based on your personal preferences or picture style. [Centered & 45-Degree Bevel Cut Design]: This photo frame mat features a dual-frame design with a smaller frame positioned in the center of the larger frame, helping to highlight the picture content. The inner frame edge is precision-cut at a 45-degree angle for a clean, professional look. [Easy to Install]: This photo frame mat is simple to use with no tools or special skills required. Just remove the back panel from your frame and insert the mat directly. [Excellent Photo Frame Mat]: This mat helps conceal uneven edges caused by cutting or sealing, ensuring a polished appearance. It securely holds smaller pictures or artwork in place within the frame, preventing shifting or falling out. A reliable choice for enhancing your photo display. Color: White Material: Paper Package Contents: 10 x Picture Frame Mounts Note: Light reflection and different displays may cause slight variations in color compared to the actual item. Measurement allowance is +/- 1-3 cm.