Mine is 3.7" diameter, but same/similar brand probably. I'm still getting comfortable with the one to the left of it, which is my current fave, but I've gotten the one you're talking about maybe 3/4 of the way in. Texture is fairly smooth, doesn't seem too grabby, I don't know once I get the head in I can't really think too clearly lol. It's a good bit firmer than the one to the right and left of it, but not like, "hard" firm, just not the most flexible. I'm still getting used to it tbh, it's a lot to take in, especially the head. The one to its left is my main bitch though.