●This item comes with 1 double mat, 1 backing, and 1 clear bag ●Thickness: 4-ply (about 2.8 mm or 1/8 inch) ●1-Pack (One Individual Mat) ●Overall Size 20" x 24" - Bevel Cut Opening Size of 15.5" x 19.5" for 16" x 20" Photo ●Acid Free (will not harm your photos), Bevel Cut (to enhance your photos)!