I loved the shape and size of the toy. It has five bulbs of increasing size. The first two were easy to insert and then the third one starts to feel very good. The fourth bulb is big enough to feel full, but not difficult to insert. The fifth bulb is the big one and looks slightly larger than an inch. I couldn't insert the fifth one at first, but after playing with the fourth one for a while, sliding it in and out, eventually the fifth one sneaks in creating a very full and pleasurable feeling. The necks between the bulbs are thin enough that once the fourth or fifth bulb is in, the entire toy will stay in without slipping out. Although long and likely having to bend inside, because the toy is so flexible, it is not uncomfortable or painful to have in.