EASY CLEAN REMOVAL: Lightly hold the top of the removable adhesive strips and slowly pull straight down to remove the picture hanging hooks and prevent damage of walls and surfaces; reuse your hook by purchasing large indoor Command Refill Strips. 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 frame hangers for hanging valuable items. SURFACE PREP: Clean with rubbing alcohol to remove grime and dust to allow the wall hangers to bond to the surface; the indoor temperature must be between 50 degrees Fahrenheit and 105 degrees Fahrenheit. WORKS ON A VARIETY OF SMOOTH SURFACES: Frame hangers work on a variety of smooth surfaces, including painted walls, finished wood, painted concrete cinder blocks, laminate, glass, metal and tiles. DAMAGE FREE HANGING: 3M Picture Hangers work without leaving holes, marks or sticky residue on a variety of surfaces so you can hang sawtooth, D ring, wire-backed and keyhole hanging frames without tools. HOLDS UP TO 8 POUNDS: One package of the Command Universal Frame Hangers includes one metal hanger, four large Command Strips, and two pairs of mini strips; one adhesive picture frame hanger holds up to 8 lbs.