The Super Air Amplifier™ Shim Set is comprised of a .006" (0.15mm) and a .009" (0.23mm) thick stainless steel shims. The patented* design of the Super Air Amplifier Shim maintains critical position of the component parts. As a result, a precise amount of compressed air is released at exact intervals toward the center of the Super Air Amplifier. Super Air Amplifiers are supplied with a .003" (0.08mm) thick shim installed from the factory. Flow and force can be increased by replacing the shim with a thicker shim. *Patent #5402938