Econo Simpson Uterine Sound is a malleable, silver plated OB/GYN instrument used for probing and dilating the uterus, as well as measuring the length of the cervical canal. It is round and thin with a small nodule at the tip and a thumb grip handle. It is very similar to the Sims uterine sound. Econo instruments are Sklar's floor-grade, disposable instruments and are sold in bulk quantities. This product has graduated inch markings and an overall length of 12-1/2 inches.