Hooks made of top-grade SUS304 Stainless Steel. Suction Cup made of ABS Chrome & Natural Rubber.
The suction cups are a softer rubber and form fit nicely to the tile surface. They have never fallen off and the hooks are strong enough to hold a soaked, full size towel until dry.
You need to remove the knob, place the hook in the grove and then place the knob back on, Then it's ready to hang.
You can easily remove the hooks without leaving marks or sticky residue, and reposition them anywhere you like!
Long and curved dual hooks are designed to hang almost anything: towels, loofahs, bathrobes, squeegees, kitchen tools etc.