VARIETY PACK: One package includes eight pairs of medium and large picture hanging strips; four pairs of medium strips holds 12 pounds with maximum frame of 18 x 24; four pairs of large strips holds 16 pounds with maximum frame of 24 x 36 WORKS ON A VARIETY OF SMOOTH SURFACES: Wall hanging strips work on a variety of smooth surfaces, including painted walls, finished wood, painted concrete cinder blocks, laminate, glass, metal and tiles SURFACE PREP: Clean the desired surface with rubbing alcohol to remove grime and dust to allow the no damage wall hangers to bond to the surface; the indoor temperature must be between 50 degrees Fahrenheit and 105 degrees Fahrenheit USAGE TIPS: Wait seven days after painting before using the Command Picture Hangers to allow paint to cure; do not hang over beds or on wallpaper; do not use the wall hanging strips to hang valuable items EASY CLEAN REMOVAL: Lightly hold the top of the removable adhesive strips and slowly pull straight down towards the floor to remove and prevent damage of walls and surfaces DAMAGE FREE HANGING: Damage free hanging strips work without leaving holes, marks or sticky residue on a variety of surfaces and remove cleanly when you want to redecorate or reorganize your space without tools, Manufacturer: 3M