MAXIMUM FRAME SIZE 24 X 36 INCHES: One package includes ten pairs (twenty strips total) of the Command 20 lb X-Large Heavyweight Picture Hanging Strips; four wall adhesive strip pairs (eight strips) holds 20 pounds; maximum frame of 24 x 36 inches | WORKS ON A VARIETY OF SMOOTH SURFACES: X-large wall hanging strips bond to a variety of smooth surfaces that include painted walls, painted cinderblock and concrete surfaces for damage free hanging | 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 | STRONG DAMAGE FREE HANGING STRIPS: Our STRONGEST HOLD with 40% more adhesive holding power compared to Command Large Picture Hanging Strips for hanging large wall art, big mirrors, wall clocks, heavy duty picture frames, and more