Air Jack Air Wedge Unlike any other Air Wedge on the market. Made of ballistic nylon with special stiffeners for easy insertion. The Air Jack from Access Tools is the best air wedge in the car opening market. The bladder is made out of ballistic nylon, not rubber, which is important because rubber stretches, while the nylon wont. This wedge is available in two sizes, large and small, the small one for smaller vehicles, with the super air wedge for large sedans/SUVs. The Super Air Jack is like the Air Jack but much bigger in order to offer a stronger hold for use in larger vehicles and trucks. Also, for ease of insertion, the ballistic nylon does not grip onto the rubber, and to further aid insertion, there is a built in stiffener that prevents the wedge from bending when you are trying to insert it.