The Air Cushions is made of thick TPU material, which is very durable and hard to wear. The valve is completely sealed, will not leak, and can be used repeatedly The air bags are very flat, only 1.5mm thick, and can be easily pushed into a small space. Without load, the cushion can be inflated to a maximum thickness of about 7cm. Air pump with a hand pump and a check valve, pumping and deflating is effortless, and you can new deflate the air to adjust the appropriate height by pressing the button The size of the mounting cushion is 16*16cm, the rubber hose is 25cm long, and the load is 200kg. One person can easily lift heavy objects, which provides great convenience for installation work. For lifting, aligning, moving, fixing, etc. Ideal for do-it-yourselfers, also very suitable for door and window fitters, Indispensable for installing windows, shutters, even heavy doors