Urethral Hegar Sounds,Surgical Instruments Medical Instruments (YNR) Double Ended Hegar Dilator 8 Pcs Set Complete Sound Set includes Eight Hegar sounds approx. 8" (20cm) long in length and double ended. tnYNR CARD DESIGN-2 (1) 1 x 3mm and 4mm, 1 x 5mm and 6mm, 1 x 7mm and 8mm, 1 x 9mm and 10mm, 1 x 11mm and 12mm, 1 x 13mm and14mm, 1 x 15mm and 16mm, 1 x 17mm and 18mm.