Dude, you're a little dizzy. A project will have many products, which means there will be many sets of molds. What molds? There are plastic dies, die-casting dies, metal stamping dies, metal stamping dies, blanking dies, trimming dies, stamping dies, forming dies, bending dies and continuous dies. In metal stamping die, a pair of dies refers to a single die, while a set of dies refers to the sum of dies needed for the final forming of products.