ASCII Stick Super L5 One Handed Game Controller.

The top dial rotates some degrees left and right to allow a small amount of custom positioning for your thumb. I found the hand comfort with the Super L5 to be so-so after gaming with it a while. It’s a little awkward to grip and Isn’t as contoured as ASCII’s other one handed controller for the Super Famicom called the ASCII Grip, which I found much more comfortable to hold.