"Black Wonder" is the beginner's edition of the "Black Eel" and "Big Boy" urethral sound. It only has one single vibration mode, but that doesn't mean it is better or worse than others. It just means you can decide if you like to play with or without vibrations; and it's the perfect sounding toy for the typical man who can't decide which of the numerous vibration settings feels best! ;)
Measurements: Total length 445 mm, insertable length 355 mm, 5,5 mm, handle 20 mm.