Hegar Disposable Urethral DilatorIf you're interested in trying some urethral sounding but don't want to commit to buying a full set, this Hegar Disposable Dilator is perfect! The disposable Helgar Dialator comes in a choice of two sizes which makes it a great choice for both beginners and experienced users We recommend you take plenty of time and use plenty of lubricant during sounding sessions.approximate measurementsOverall length: 203mmSound width (Medium): 3mm & 4 mmSound width (Large): 5mm & 6mmThis product is certified 100% Non-Magnate and medical-grade steel. Beware of cheaper products that are not solid surgical steel but chromed steel or poor quality surgical steel that contains Magnate. Magnate is the ingredient that makes steel rust. We will only include this endorsement on our 100% surgical steel products.