Strips hold firmly and will NOT release until YOU want to take them down. Simply pull tab and stretch adhesive to remove strips. Removes cleanly - no nail holes, cracked plaster or sticky residue. Works on a variety of surfaces. Each set of picture strips takes 2 strips. Strips come in packs of 4 sets. Poster Strips are 1 1/2" x 5/8". Medium Picture Strips are 2 3/4" x 3/4" and large are 3 5/8" x 3/4".