Let me preface this by saying I bought all these strings used here (thanks!). I used to play what I thought were Spiro Weich. They were red on the bottom, red on the top, big nearly round steel balls. They measured .111, .082, .068, .049 Then I bought what I thought were Spiro Mittles, red on the bottom, purple on top, big nearly round steel balls. When I pulled those off today to try something else, they measured .111, .080, .065, .053....or nearly identical! I thought Mittles were supposed to be fatter? Maybe I need Starks, I want big fat strings!