Pure Nickel - You can find this a handful of different ways. I purchased my nickel in the shape of two 4oz plates on eBay for ~$5, a very good hardware store should carry nickel welding rods, and most new music retailers will have Ernie Ball "Pure Nickel" guitar strings. https://nickelplating76531.blogspothub.com/28664147/what-does-nickel-plating-near-me-mean