It's a buttplug. Goes in your butt. Stays there.
Q: What type of buttplug is it? 
A: Buttplug kind.
Q: Does it have any special or distinguishing features?
A: When you put it in your butt, it's in your butt, and when you take it out, it isn't.
Q: can you at least *try* to sell me on this product, Kenton?
A: It's a tried and true design and it doesn't cost a lot of money. There isn't much to say about it because you already know what it does, and whether or not you can afford it. It's a plug. It goes in your butt. It's twenty-four dollars. I might even make more sizes if people want them.
Firmness: medium soft, shore 0050
bulb: 52mm long, 37mm diameter (2", 1 1/2")
stem: 30mm long, 20mm diameter (1 1/5", 4/5ths")
base: 47mm diameter (1 54/64ths. look, my design is all in millimeters, i'm here to make fun of fractional measurements and chew bubblegum, and i havent had any gum in YEARS.)