The for putting the shelves up in the shower without screwing them into the wall (the glue and “tape”) are not good and also not appropriate for the shelves. For example, it says to put the glue on the shelf and then the provided tape over the shelf to hold it on the wall for 48 hours as it dries. The tape wasn’t strong enough to do that, and also isn’t able to be applied across the shelf as the description given in the instructions. Basically, it’s like they gave the materials of a different shelf with this one. I just got command strips and did it. 

Otherwise the shelves are great and if you plan to screw them into place, you’re golden.