These are a great set of strings, I love playing them the fresh tone you get from new strings lasts for hours of playing, Over that of which a lot of other string that sound in the their prime for only a half hour sometimes less, I love how you only get 3 paper cases inside containing 2 strings each, they put a high gauge and a low gauge together for easy definition between both. The only problem I've had was that the last pair I received had a little rust but its the first time that's ever happened me with these tone monsters. so other than that one experience I can understand why the metal god himself chose these as his signature strings!