Honestly these were the cheapest of the heavier guages that thomann stocked, so I bought a couple sets of 12's and 13's, so I stuck the 12's on a les paul in D standard and now that thing is a rock/metal machine and a half, the heavier strings make me forgive it's thin neck for some reason, but hey ho I now actually like playing that guitar, and as for the 13's, C# on and SG for some sabbath riffing and they are awesome