This item comes with the pre-cut mat, backing board and clear bag.
The opening size is 10.5"x13.5" for 11x14 print.
The mats are beveled cut.
The backing is 4-ply thick.
The re-sealable adhesive strip of the clear bag is below the opening of the bag instead of on the flap.
This mat is 8-ply thick (double the thickness as the 4-ply mat).