These are beautifully detailed antique watch movements that have been removed from antique watches, then cleaned and polished and attached to silver plated cufflink backs. The photos really don't do these justice they are stunning in person and a perfect size for cufflinks. You can choose from Oval shaped watch movements that are 14mm (0.55 inch) across (pic 1) or Rectangular shaped watch movements that are 16mm (0.63 inch) across (pic 2)