Glass Dome DNP - Doctor of Nursing Practice - Mini Caduceus Clip On Charm. Glass Dome is approx: 0.9 x 0.7 x 0.2 inches (HxWxD) including loop. High quality printed paper sealed under a glass dome in a metal frame. Silvertone Swivel Lobster Claw Clasp is approx. 13 x 7 mm. Mini caduceus is approximately 0.33 x 0.20 x 0.10 inches (HxWxD). Clip On Charms may be added to your favorite jewelry from bracelets to necklaces. Makes a great medical school graduation gift!