EXP (extended play) Nickel Round Wound

D'Addario EXPs deliver the most natural-sounding, longest-lasting coated strings available. Yes, you are right; there are other well-known brands but we think these are the best. Through their advanced EXP Coated Technology, they have perfected the art and science of coated string-making to to produce extended play strings that sound identical to their world famous XLS. Plus the corrosion resistance and logevity of the plain strings has been dramatically improved through a new compound tin-plating process.
And what about the feel of EXPs? To be honest we don't believe you'll notice any difference from uncoated strings. Amazing!