This is an attractive toy, and slides in easily enough, making you stretch by the second knob, and strain to open up by the third. It would be fantastic had the maker left more space between the base of the plug and the biggest knob. As it is, the plug will NOT stay inserted.
As an insertion toy, this gets a 5 out of 5 stars, but unfortunately, it is supposed to be a butt plug, remaining in place until an external force is used to retrieve it. Therefore, it gets 0 out of 5 stars for its primary purpose.