Our SonoTone SonoCore strings will give you a huge, round, and warm sound. Our custom round cores, with our exclusive pure nickel alloy wrap, provide you a more natural and powerful playing experience... larger than life sine waves. Truly vintage and superlative. Not just for Jazz… Re-Discover your instrument with SonoTone SonoCore strings. SonoTone premium strings are expertly designed to offer unparalleled tone and feel in any playing style. We understand that you are serious about your tone, and we have developed an array of different formulas to help you master the art of your sound. Our custom formulas can faithfully produce authentic vintage tones from the 50’s, 60’s, 70’s and beyond! By combining our time-tested American craftsmanship, with a modern approach to the needs of today’s guitar player, we have created a line of strings that possess unmatched fidelity and amazing feel… the kind of feel that makes it hard to put your guitar down.