NO DAMAGE: No drilling, no screws, no holes, no glue. SUPER SUCTION AND LONG LASTING: The suction cups are made of high-quality ABS plastic and rubber, which can withstand loads up to 13 lbs and maintain suction for years. Easy to install and remove: Just push or pull the lever handle to lock or release, it is designed to be detachable and reusable for replacement. Tips and Precautions for Use: This product is a pack of two hooks. It is only suitable for non-porous and smooth surfaces, such as polished tiles, mirrors, glass windows, polished stainless steel static walls and plastic panels, etc. It will not work on any porous raised, rough or textured surfaces such as rough coated surfaces, unpolished marble or wooden doors, rough porcelain surfaces, etc. If you have any questions, please contact us in time.