DR's Dragon Skin+ Coated Bass Strings combine Accurate Core Technology™ with coated wrap wire made from quantum nickel, resulting in long-lasting strings with a bang-on feel and sound. The patented K3 coating adds an ultra-thin yet extra-tough layer of protection that doesn't affect string vibration whatsoever, while the special locking grooves boost the tone,projection, and tuning stability of these high-output strings. This set of lights includes gauges .040 to .0100.