It is made of high quality ABS material, strong and durable, with a load capacity of 7.5 kg / 16.5 lbs, which has stronger adsorption capacity than traditional suction cups. The suction cup has a vacuum lock ring, which can effectively prevent the suction cup from releasing air pressure due to tension, and firmly lock the vacuum. Note: The weight cannot exceed the load capacity of 15 kg, otherwise it will fall off. The sturdy plastic handle, due to its function underneath, your hands will not slip even in wet conditions, providing a safety protection for the bathroom, tub and shower. Note: Do not force or tear the handle. The part marked "OPEN" and "CLOSE" above the rotary suction cup. Clockwise rotation is the locked state, that is, the "closed" state. Easy to install and uninstall, no need to use tools to install and delete. It is lightweight and compact, so you can take it with you when you travel, and easily install it in a hotel room or bathroom, and carry it around as needed, just push the locking latch down to secure the Flip up. The armrest can be firmly fixed on any flat, non-porous surface. Portable bracket handle, suction cup vacuum pressure provides super grip, more convenient to open sliding doors/windows. Can be used on any flat surface without holes. It can only be installed on any smooth flat surface, including tile, glass, metal, plastic, etc. Please Note: Do not use on rough or uneven surfaces! ! !