These archival protection envelopes are acid and lignin free. Each pack contains 10 envelopes and are great for CD’s Negatives, 4×6 photos and index prints. Back flap of envelopes includes pre-printed space for date and subject allowing for easy identification and organization. Also there is a clear window front for viewing index prints. Can hold up to 36 4×6 prints. Protect the longevity of your photography media by storing it in an acid-free archival envelope. Helps keep photography safe, organized and accessible. Comes nicely boxed and peggable for easy display. UPC coded.