The device consists of a clear, flexible, polypropylene sheath that is 26.5 cm (overall) 23.5 cm (effective) length with a 3.1 mm OD (Outside Diameter) and a 2.6 mm ID (Internal Diameter). The sheath is marked with colored, graduated markings from 4 cm to 10 cm, distance from the distal tip of the sheath to indicate the depth of insertion of the sheath into the uterus during use.