I use brass rings ,3/16 X 1@3/8 ID , I start with 5 then in an hour I put one more on , then again and again when I get to 9 , that's enough for me , I do it for the feeling I get , not for the hangers as to say , but they do hang nice and always,have my balls wet with baby oil , so no pulling and pinching and that dull ache is really a joy