This 2 piece thin metal etched die set is part of the Holiday Medley Collection designed by Becca Feeken for Spellbinders. These dies are compatible with leading die cutting machines (sold separately). These bells are designed to have slots and perforated fold lines. Mountain fold the outer lines and Valley fold the inner lines. You then slide the bells together and interlock the cut slots. Repeat until you have the look you want. The bell dimensional doily measures 2.3' x 2.5" and the bell insert measures 1.2" x 2.1".