Monel (aka Nickel Bronze) has built in natural resistance to tarnish and corrosion yet it feels great to the touch and has it's own unique tonal color. This set has a round Core and gauges are 13-17-26w-36-46-56. This gauging is perfect for most players wanting lots of volume and doing the down tuning on the A and low E. Here's a video showing the tonal differences between some of the alloys that we offer including Monel.