Item Type: Door and window installation air cushion Material: Composite fiber material (thick type) Gross Weight: 315g / 11.1oz Color: Green Air Cushion Size: 16x16cm / 6.3x6.3in Product Features: Strong compressive and load bearing capacity, and a single product can withstand a weight pressure of more than 240 kg. After being full of air, the object can be lifted up to 9CM. It can be used repeatedly.(At least two or more for glasses installation at a time, and the number of glasses will be more if they are installed at other homes.) 1Versatile: Use as a pry bar or lever for door, window and cabinet installation. It can also be used as a car unlock tool or car repair. Practical home installation and repair tools. 2Durable: It does not leave any traces in the surroundings. The cushion is also reinforced with fibers, making it durable enough to be used again and again. 3Strong Load Bearing: Each air wedges is powerful enough to lift 240kg. This set has 4 air wedges. 4 used together, can lift up to 960kg, more stable and safer. 4Convenient Storage: When fully deflated, the installation cushion is only 1.5mm thick, which makes it easier to wedge door clearances and installers' kits. 5Suitable Size: This door and window installation air cushion has a suitable size of 16x16cm / 6.3x6.3in. When installing, the size is more suitable for the furniture, and it is more comfortable and flexible to use.4 x AirShimPump