This is an archival tissue by the leader in archival products, Lineco, and is designed mainly to repair tears in paper including art, documents, maps and artifacts. You may also use this for hinging or reinforcing paper. It is pH neutral and pressure sensitive and is safe and easy to use. Complete directions are on the box. We all need some of this on hand for those old documents! Measurements: 1/2" wide x 600" long.