The single rosebud sound is an excellent entry level and advanced device for urethra play. These chrome-plated sounds go easily and smoothly into the urethra, thereby stretching it giving the user great erotic pleasure. There are four urethral sounds that graduate in size: small (3 mm diameter), medium (5 mm diameter), large (7 mm diameter) and x-large (9 mm diameter). The cost given is per urethral sound. Choose the size that you would need.