The medium picture hanging strips were used to hand pictures for less than six months. When I carefully removed the strips, paint and drywall was attaqched to the strips.
My walls were painted with two coats of an eggshell paint finish.
I am afraid to change the other pictures I used command strips to hang.
I found that a lot of my pictures actually hung better when I used the command poster strips instead. Pictures fell and broke along with two mirrors. The poster strips overall worked better than the picture hanging strips.
Seriously these are great for hanging average size pictures. Have yet to try with anything very large but they make picture hanging (which I dread) so much easier! I love them! Haven't tried to remove them from the wall yet as I just put them up so we will have to see how "damage free" that is. But I tell ya, no more nails for me!
Before purchasing this product I made sure it would work with the size and weight of my picture. I carefully followed the instructions on the package and hung my picture on the wall. Less than 5 minutes later it crashed to the floor, breaking the glass. Now I have to make another trip to the store to find something else to hang my picture and buy new glass. I am very very disappointed in this product.