This is a strong suction cup handrail for tiles. It's a介護用品 (kaigo-youhin - care product) that uses suction cups to create a vacuum and lock in place, which can be released to remove it. When the vacuum is created, the indicator on the side turns green; when the vacuum is lost, it turns red. While there is some discoloration from use in a bathroom, it still provides a firm grip as a care product. It's easy to attach and detach, but after years of use, the side color may change from green to red, indicating it's time to reattach it. It cannot be used on tiles smaller than 11cm on a side, as a vacuum cannot be created. To use, place the suction cups with the FEIDASH logo upright, press them against the surface, and then push the logo down to lock. There are no instructions. This is a set of three.