Material: the clear PVC suction cup and durable metal hooks are solid and anti-rust; They will not yellow, deteriorate or lose adhesion over time Applicable scenes: these clear suction hooks can be applied on windows, mirrors, glasses or any other clean, slick, non-porous surface Application: the strong suction hooks with a locking lever action for extra strength; You can use them in bedroom, bathroom, kitchen, living room, etc. Warm note: these suction cup hooks are easy to install, please always test a suction cup before hanging heavier objects or valuable items