I have a size small Klutz glove and think I use a size 6 ring (don't wear them). It's too big for me but I use it when cutting a lot. I know I should wear it all the time because I have nicked myself a few times lately. I just have trouble picking up pieces with the glove on so have to put my rotary cutter down and use my right hand to do that. Takes more time. Sounds like the medium would work for you.