paper photo frame matboard:Good to match your photo frames. outer size:12. ... size:7*10'' thickness:2.8mm, 2 ply paper photo frame matboard: 1. professional manufacture of mat board(matboard, mount board ... of surfaces and sizes8. can be used for matting photos, art, and needlepoint. Also great for crafts, backboards, signs, children's ... alkaline reserve of 3-5% pre-cut light blue photo frame