One click tells you the Command™ Picture Hanging Strips are locked in and holding tight. Best of all, when you are ready to take down or move your pictures, they come off cleanly— no nail holes, cracked plaster or sticky residue. Command™ Picture Hanging Strips come in three sizes: large strips hold most 24 inch by 36 inch frames. Command™ Large Picture Hanging Strips hold up to 3 pounds. This pack contains 4 sets.