Archival Quality: These mounting corners feature a pressure sensitive. These mounting corners are archival and acid free. Basic Info: Acid-free material created and made in USA. Design: Quality in material and in use, these corners are strong enough to hold your pictures in place.

Ivory Acid-Free 0.5″ Archival Photo Corners, Self Adhesive, Pressure Sensitive, Non-Yellowing, Mount Pictures Without it Touching Tape, Scrapbooking, DIY, Displaying Pictures. Archival Quality: These mounting corners features a pressure sensitive, non-yellowing acrylic adhesive.