Beware!  These strips do not hold their adhesive in hot weather. A few months ago,  I attached several framed pictures, acco4ding to directions, weight limits, etc to freshly painted, clean walls and now that the weather is hot, 4 of them have come crashing down, destroying the frames and taking some of the drywall with it.  What seemed great to begin with is now a disaster.  I'm using old fashioned hooks or even nails in the walls from now on. Less damage!