A complete set of surgical tools for urethral dilatation and evaluation of the urethra and bladder neck is the Sound of Van Buren, Set of 15. Because each sound in the set is curved and 11 inches (about 28 cm) long, it is easier to navigate precisely throughout processes. With diameters ranging from 8 French (2.6 mm) to 36 French (11.9 mm), the set is versatile enough to fit a range of patient anatomy.