2.25" Pinback Button Sets - By American Button Machines - 15/pkg These pinback button supplies fit Industry Standard Sized 2-1/4" American Button Machines ONLY Complete pinback button set includes enough parts to make 15 pinback buttons Durable metal button parts complete with mylar, shell and pinback Industry standard size, not for use in Badge-a-Minit Machines. A 2.25 button machine is needed to press the parts together and is not included with this item