Our Polyester (Mylar) Sleeves are made from crystal-clear archival polyester, approved by the Library of Congress. We use DuPont inert Melinex® or a suitable equivalent. The material we use for our sleeves has passed the Photo Activity Test, which certifies that the material is safe for long-term storage
We manufacture two different styles of photos sleeves:

L-Sleeves
Tuck-Lock