Holy crap is this guy huge! The insertable length is 10 inches and the diameter is just under 2.5 inches. If you're looking to this for your first anal/vaginal experience with toys, I'd advise looking elsewhere for something around 1.5 inches in diameter or smaller. Trust me, this isn't for you. For those of you who are adventurous and want to be totally stuffed, this could do you some good. Took me awhile, but I got this sucker in and it felt great. Probably my favorite toy in my entire collection because it gave me the strongest orgasm yet. :)