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Since 1989, DR committed to the same, handcrafted, superb quality instrument strings. The best of old-fashioned handmade handmade with cutting edge materials or string coatings, DR continues to push the limits of the string-making process. The commitment to quality is what has countless top-flight bassists and guitarists with DRS - from U2 to string-up Adam Clayton of Phish Trey Anastasio and everywhere outdoors and. For reliable tone, acoustic or electric guitars - you can rely on the handmade strings of Dr. With the typical Dr. extra-life Black Beauties bass strings, they hook the crisp tone, clarity and volume of craftsmanship with strings from DR. However, you get the advantage of Dr. thin coating on the strings and wrap wire, which extends the service life of your favourite strings. And, as the name suggests, DR extra-life Black Beauties Sport has a stealth-style black coating.