I ordered these strings thinking they would be be the best of the best - unfortunately I was wrong. The Twister A on my first set unravelled as I put them on and when I put my replacement set on, I found the Vintage D and G to be a great tone, feel and tension, but the Metal cored Twister E and A to have a totally different qualities. Far more tension, a deader tone and a strange sticky feel. They literally feel like playing 2 different sets of strings. And the nylon winding on the A started coming apart under the tension, meaning the could not be returned. Try before you buy, not recommended, for rockabilly/slap playing at half the price try a full set of Vintage Gut-a-Like.