Premium nylon, soft compression case organizes and protects tools;Instruction guide reference booklet informs you of proper use;Craft;Full set of precision knife blades is perfect for wide variety of uses;This is an aftermarket of generic part;Xacto basic knife set for lightweight precision cutting;Ideal for cutting wood, cardboard, paper, plastic, cloth and foam board;Comes with a variety of blade types including straight edge, general purpose, fine point, and scoring blades;Stored in a convenient and compact soft compression zippered case;3 knives, 13 interchangeable blades for a wide variety of cutting tasks