Since 1989, DR has been committed to crafting hand made, superb-quality instrument strings. By blending the best of old-fashioned handmade craftsmanship with cutting edge materials or string coatings, DR continues to push the boundaries of the string-making process. That commitment to quality is what has brought countless top-flight bassists and guitarists to string-up with DRs - from U2's Adam Clayton to Phish's Trey Anastasio and everywhere outside and in between. For reliable tone - acoustic or electric - you can rely on the handcrafted strings from DR. With the DR Extra-Life Black Beauties bass strings, you'll snag the signature crisp tone, clarity, and volume of DR's traditional handmade strings. Yet, you'll get the added bonus of DR's super-thin coating on the plain strings and on the wrap wire, which extends the life of your favorite strings. And, just as the name suggests, DR's Extra-Life Black Beauties sport a stealth-style black coating.