This item comes with the pre-cut mat, backing board and clear bag.
The actual opening size: 3.5x5.5, fits 4x6 photo or picture. 
The backing is also 4-ply.
The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.

Our acid-free whitecore matboards are a 4-ply papermat that provide the aesthetic and design benefits of a bright white bevel whitecore.
It can be used for matting photos, art, and needlepoint. Also great for crafts, backboards, signs, children's projects, and school projects.

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(Free Shipping available for continental US only. For PR, Alaska, Hawaii, APO and FPO please email us first)