The Super Air Knife™ Shim Set is comprised of a .001" (0.03mm), .003" (0.08mm) and, .004" (0.10mm) thick plastic shims. The shims are used to increase or decrease the force and volume of air that is both consumed and output from the Super Air Knife. A .002" (0.05mm) shim is installed in all Super Air Knives from the factory.