Replacement Cards For Jumbo 2-Pocket BHP Envelope Pack of 25

These cards are acid-free, 110 lb grey index cards designed for archival storage. They fit 3-ring binders and are made of polypropylene, claimed to be durable and resistant to environmental damage.

• The description claims the cards are acid-free and non-toxic.
• The description claims the cards resist cold cracking, age discoloration, and UV damage.
• The description claims polypropylene is a recommended archival storage material by the Library of Congress.