M-1400 Martin Marquis Silk & Steel Folk Acoustic Guitar Strings: Marquis Silk & Steel folk acoustic guitar strings have an intermediate wrap of silk fiber between the core and the windings of the wound strings, plus all strings have additional silk wraps at the ball ends. The silk at the ball ends cushions the contact stress between the strings and the bridge, reducing wear on the bridge plate and pins, and mellowing out the overall tone. The silk wrap under the outer windings softens the overall sound of the stings, yielding a very mellow and pleasing tone. Made with Martin's commitment to quality and precise manufacturing, M-1400 Silk & Steel Folk Acoustic guitar strings are high in value, low in cost. What else would you expect from C. F. Martin, a company renowned for fine acoustic guitars and guitar strings? Diameters: .0115 .014 .023 .028 .038 .047 inches From the C. F. Martin Company. Available for Order