I am using an Emerald Vibe,drilled 4/12 by 4 with pin in the ring finger.I can play up eight board for about one game,then when that goes i try 10 or 13 board and by the third game i am swinging,which i am not good at,over 20 to ten.My revs i am not sure but i would guees in the medium range. I hope this helps