Big Horn 13202 Contractor-Grade Air Pump Inflatable Shim Bag. The Air Inflatable Shim Bag is made of extremely durable ballistic Nylon fabric and has a max load capacity of 300 lb. The 6" x 6.5" air cushion bag is 1/16" thick when deflated and 2-1/2" thick when inflated. 6" long tube & 1-1/2"x 3" rubber bulb are attached and ready to use right out of the box. Hand operated pump gives maximum load of 300 lb. per bag inflates and deflates easily.