Opening Size Instructions
Openings are cut to the size you specify. Your opening should be 1/2" smaller per dimension than your artwork. This gives space to hinge and prevents artwork from falling through the mat opening. Example, an 11" x 14" photo would use a 10 1/2" x 13 1/2" opening.
Sizing is listed by width first, and height second. Example 8" (width) by 10" (height). Please make sure that the opening width and height do not exceed the size dimensions.
Peterboro offers pigmented conservation quality surface papers on 85% of the White Core mat boards and a conservation backing on all. Peterboro Whitecore is the highest quality Whitecore product on the market. Buffered with calcium carbonate, these high alpha cellulose mat boards offer a bright white core and over 300 unique colours and textures.