Sklar's Hegar Double-Ended Uterine Dilator Set is a set of 6 manual, probe-style instrument used to dilate the cervix. They are solid, nonflexible, and available in multiple diameters. These dilators are slightly curved in opposite directions from the center and have smooth, rounded tips. This product contains 6 double-ended dilators: 3mm/4mm, 5mm/6mm, 7mm/8mm, 9mm/10mm, 11mm/12mm, and 13mm/14mm. The overall length of each is 8 inches. This set comes in a zipper case.