Set includes: 10 8x10 White Mats, 10 Backing boards, & 10 Clear Bags
The mat opening size is 4.5"x 6.5" for 5x7 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.