Command Black 20 lb. XL Heavyweight Picture Hanging Strips let you decorate how you want, when you want, without damaging surfaces. A great home improvement item, these picture hangers stick on a variety of smooth surfaces without leaving holes, marks or sticky residue. Use these wall hanging strips to hang heavy duty picture frames, large wall art, big mirrors, wall clocks, signs, dry erase boards, holiday decorations and other home decor. XL picture hanging strips bond to a variety of smooth surfaces that include painted walls, painted cinderblock and concrete surfaces for damage free hanging. Perfect for home renovators and students, use Command Picture Hanging Strips in your home, office or dorm to elevate the appearance of your living or working space without tools. Directions are included; follow the directions closely to use the 3M Wall Hanging Strips as intended. A clever decorating solution that doesn't damage surfaces, these wall hanger strips will help you fearlessly change your space. One package contains four pairs of heavy duty x-large Black picture hanging strips. Four pairs (eight wall hanger strips) holds up to 20 pounds with a maximum frame size of 24" x 36". Decorate, organize and celebrate damage-free with Command.Details:Black24" x 36" maximum frame size4 adhesive wall strip pairs (8 strips total, holds 20 lb. / 9 kg)Works on a variety of smooth surfacesClean the desired surface with rubbing alcohol to remove grime and dustEasy clean removal