Keeps literally what it promises!

I was quite critical when I ordered this wall hooks - stops by an adhesive ???
In the "suckers" from Wenko I had been out of luck (or me hired too stupid), but I wanted to get it a try - and now the wall hooks are already for more than 4 weeks in operation, one of them with relatively heavy silicone Cloths, and holds and holds and holds!
I have adhered strictly to the user manual, which is well written and understandable, probably this is the whole secret. Parallel I also have a double towel rail (Power - Loc Towel Rail Duo Elegance) and bought just installed - the sticks steadfastly keeping even two wet bath towels stand. To me, nothing more with suction cups in the apartment when drilling is not possible or not wanted, then I will take up this variant!