This set of dies is part of the Picket Fence Studios Slim Line Die Cutting System Collection. This set of thin metal dies contains 6 pieces, the large mushroom die and 5 smaller dies. These are very unique dies, you will never tire of creating! These dies are compatible with leading die cutting machines (sold separately). The largest die, the mushroom circle, measures 2.5" x 2.5" and the smallest measures 0.37" x 0.25".