The Air Jack from Access Tools is the industry’s best. The bladder is made outof ballistic nylon, not rubber, which is important because rubber stretches andnylon doesn’t. The Air Wedge is meant for smaller vehicles. A built-instiffener further aids insertion by preveting the wedge from bending.There is a quick instructional manual included or an online access code included with the kit that provides quick,expert training on the proper use of the included tools. Made of ballistic nylon Won’t damage the vehicle Perfect for small to medium size vehicles Inflates easily and quickly Extremely durable Slides easily over weather stripping 6″Lx5-1/2″W