all the 16 pieces file are made by T12 Drop Forged Alloy Steel, the long lasting teeth were deeply milled tempered and coated for durable cutting and filing performance 16 pieces file set comes with 4 large files - flat/triangle/half-round/round file and 12 pieces precision needle file all files are packed in a rugged, compact carry case for storage and portability. Each tool fits snugly into its respective place to prevent moving around and scraping long and soft handle - rubbery handle with long length to bring your comfortable handling that will allow for hours of use buy with confidence - handy tool bag with a wide variety of files will allow you easily finish and enjoy woodworking