i was initially a little disappointed when this arrived as i expected it to be bigger than it is, i have another one from this range and i expected this to be as big but it is smaller, the first bulb is 28mm wide, the second is 29mm and the base is 40mm, having said that my attitude changed when i used it, the bulbs feel great when inserting and the vibes are fantastic with great patterns that keep you enjoying the sensations as the battery lasts forever, great anal toy that i enjoyed very much, buy one