Set includes: 25 16x20 White Mats, 25 Backing boards, & 25 Clear Bags
The mat opening size is 10.5"x13.5" for 11x14 print.
The mat is 4-ply thick (about 1.4 mm or 1/16 inch).
Backing Board Color is White on both sides
The clear bag has re-sealable adhesive strip below the opening of the bag instead of on the flap.