Contains 1 of each thickness: 0.001″, 0.0015″, 0.002″, 0.003″, 0.004″, 0.005″, 0.0075″, 0.010″, 0.0125″, 0.015″, 0.020″, 0.025″, and 0.030″. Made of the highest quality plastic material: 0.001″ to 0.005″ – polyester, 0.0075″ to 0.030″ – vinyl. Asst contains 13 blades riveted together for on-site convenience and is packaged in a sturdy vinyl case. Noncorrosive, nonconductive, nonspeaking, and nonmarring. Color indicates thickness . Precision Brand® Feeler Gage is used in manufacturing and maintenance operations wherever setting close spacing or checking extremely tight tolerances is required.