DAMAGE-FREE PICTURE HANGERS: Includes 12 pairs (24 strips) of White Command Medium (10lb) and 16 pairs (32 strips) of White Command Large (15lb) Picture Hanging Strips, unique hassle-free wall hangers for hanging pictures without nails or damage | 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 | 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