ELECTRIC GUITAR STRINGS LIGHT: .009 .011 .016 .024w .032 .042 The PURE BLUES series by DR Strings uses old style construction to improve modern performance. PURE BLUES strings are handmade with pure nickel windings upon round cores. While this is a slower, more expensive method of stringmaking, it produces a string acclaimed for increased sustain and vintage tone for either rhythm or lead. DR-PHR9$6.42 Click here for more information on Round Core strings.