These are great for adding storage to any stateroom, as the ceilings and walls are metal. More than just holding hats, cables, or anything else your clients don't want stuffed in a drawer, they're also great for hanging clothes out to dry. No guessing whether a stateroom has a clothes line in the shower, figuring out where to put clothes when using the shower, etc. Plus, we find that clothes dry much quicker with the airflow in your stateroom compared to the restroom.
Note that these hooks are made of neodymium, and much smaller than some you might see online, but are just as strong, capable of easily holding wet garments with ease while taking up almost no space in your luggage or dopp kit.