1.snap frame,mitred corner 2.25mm aluminum profile 3.MDF or PP back panel,clear PVC face ... with the full international standards. 1.Made by high quality aluminum, MDF or PP back board and clear PVC face ... film.2. The width can be 32mm, 25mm.3. Round or mitred angle4.size: A3/A4, other ... 20/5pcs/CTN (A3) The more quantity, the better price. aluminum clip snap frame, 25mm, mitred corner