The Acoustic SP (Martin Strings) is the best strings that I've bought for sure. The bronze extra lights are easy to the touch and the sound on my Adamas 12 String Guitar is "unbelievably" great! Certainly, they are the best strings I have purchased to date and I plan to order more in the near future. Sweetwater has the best customer service and fantastic personnel. I am very impressed with their follow-up on their customers and genuine care. The shipping was right on time and on my door steps. Very special, indeed. In fact, my new sets of strings came with a thank you letter and a small bag of candies that my wife enjoyed, too. Awesome! Thanks, Sweetwater!