Totally ring. I have two huge calluses on each side of my ring finger. Only have one callus on one side of my middle finger and have a callus on the back of my pinky finger because I tuck it for more side rotation and cleaner release. Used to have blisters and calluses long, long time ago but when I went to a 1/4 forward on my thumb and went to a tighter thumbhole and using white 1" tape when needed, my thumb is soft. My ring finger has actually changed form from bowling and is deformed a little. This is due to not having grips which is one of the only downsides to having bowling balls drilled finger tipped straight into the ball and also pinky tucking puts more strain on the ring finger from my experience. But I have tried finger tips grips which I hate and I can't seem to go back to putting the pinky flat on the ball as both elements are addicting and feel better to me...especially my scores.