ARTEZA Hobby Knife Kit (Set of 17) Set of 17 Includes: (1) precision handle, (1) trimming handle, (1) cutting handle, (13) assorted blades, and (1) cutting mat Set comes in a protective storage container that features a magnetic strip to keep blades organized Blades are constructed from SK-5 high quality tungsten Japanese steel The self-healing, 3-layer, 3.0mm thick, cutting mat measures: 3.5 x 7.1" Corrosion resistant anodized aluminum handles for durability