Excellent Quality of Hegar Dilator Double ended Set 08 Pieces in Nice Zipper Bag Surgical Medical GYN Quality Complete Sound Set includes eight Hegar sounds approx. 8" (20cm) long in are approximately 8" length and are double ended. 01-Piece 3mm and 4mm, 01-piece 5mm and 6mm, 01-piece 7mm and 8mm, 01-piece 9mm and 10mm, 01-piece 11mm and 12mm, 01-piece 13mm and14mm, 01-piece 15mm and 16mm, 01-piece 17mm and 18mm.