Cetainly not a gauge of string I have used before, and yes I did buy them from Thomann because I am a bit of a "Mayer" fan. Replaced them on my Strat (which had 10's before) I did notice a difference regarding feel and tone, only slightly but it was there. Didn't have to adjust anything on the guitar they fitted just fine. Slightly more expensive than a set of D'Addario's but they do come in a nice tin!!!