DR Strings Electric Guitar Strings, Black Beauties - Extra-Life, Black Coated, 7-String, 9-52 Gauges 9-11-16-24-32-42-52 The latest in coated technology for increased tonal life Black precoated wire for fast and smooth fingering Advanced coating for EXTRA-Life and Protection DRs EXTRA-Life Black Beauties offer guitar players a superior black coated string without sacrificing the crisp tone, clarity, and volume of traditional DR HandMade Strings