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 performance16 pieces file set comes with 4 large files - flat/triangle/half-round/round file and 12 pieces precision needle fileall 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 scrapinglong and soft - rubbery with long length to bring your comfortable handling that will allow for hours of usebuy with confidence - handy tool bag with a wide variety of files will allow you easily finish and enjoy woodworkingREXBETI has always been up to the mark with our marvelous range of tools. REX035 16-piece alloy steel file set comes with 4pcs large files and 12pcs micro files, which includes all the most reached for file types and sizes for the DIY woodworker or professionals looking to make the finishing touches to wood, metal, mirror, glass, tile, ceramics, leather and plastic. For use around the home, garage, workshop, work or on the job.