Damage-free Command™ Assorted Picture Hanging Strips hold 4 - 16 lbs (1.8 - 7.3 kg) and come in three different sizes. This package contains 18 pairs of strips: eight large pairs, six medium pairs and four small pairs. Caution: do not hang over beds or on wallpaper. Do not hang valuable or irreplaceable items.Command™ Picture Hanging Strips work on a variety of surfaces and make decorating quick and easy. One click tells you that the Command™ Picture Hanging Strip is locked in and holding tight, and when you are ready to take down or move your pictures, they come off without damaging your walls with nail holes, cracked plaster or sticky residue