The Gold Circles One Set of Nestabilities by Spellbinders features Imperial Gold technology. The seven dies make it easy to cut, pierce, emboss and deboss beautiful designs. Use the dies individually or mix and match to create over 20 designs. These dies are compatible with most die-cut systems. Use the Spellbinders Junior Magnetic Placement Mat (sold separately) for these and all other Imperial Gold dies. The die sizes are approximately: 1/2", 1 1/4" (inset), 2", 2 1/2" (inset), 3", 3 3/4" (inset), and 4" (border).