The Nikki Sixx HD SS Bass Strings set comes in the gauges he uses - .050 .070 .090 .110 - and are made of a special stainless steel alloy that has a bright and cutting timbre to it. They feature the Dean Markley Hyper Elliptical Windings (compressed from side to side), for more mass and tone, as well as extended life. They are designed for a more relaxed feel, with less squeak and fewer sliding noises than normal strings.