I bought two anchors from Amazon. I love them both. They are the best improvement on the butt plug EVER.
These guys stay in place, really fill you up, and are comfortable for hours. They're made out of very soft flexible stuff. Did I mention, they're dirt cheap?
I bought the medium, and the XXL. The medium can be used by just about anybody, not even an inch and a half diameter. Buy one!
The XXL is a toy for the experienced player. Two and a half inches in diameter, but opens up in your butt into something enormous. Smaller than a fist, but that same kind of feeling.
I've heard complaints that they are hard to insert. I fucked around with mine, and dropped it (or should I said it sprung out of my hands) a few times. I discovered the trick. Hold it closed with as many fingers as it takes, position it, and sit down, on a chair, or toilet seat. It will slip right in.
One of the best toys ever made.
https://www.amazon.ca/gp/product/B01CT9RM6E/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1