Kelvin was my second toy from Bad Dragon and was one of my 21st birthday presents to myself. Found out when I used him that his knot was way to large for me to take. I got him as a large since he shared some similarities in size with Duke. He's blue, large size, medium firmness and has a tube. Took a long time to be able to take his knot comfortably without any pain. Even now though it's quite a stretch to take. I think because of my third toy that one helped me be able to stretch a little bit more for him.