content: These hooks are excellent, if you are not sure of your needs or do not want to drill holes. I needed hooks on the side of a bookcase and piano for my daughter to hand her bags. Drilling holes was not an option and these hooks are doing the job very well. You need to follow the instructions carefully and wait for 24 hours before hanging anything on them. They come out very easily (again follow the instructions on removing) without leaving any mark.The only negative is that they are aesthetically not that pleasing. Given the weight tolerance of these adhesive tapes, 3-M should be able to come up with with some real metal ones.Overall, a great product and would highly recommend it.