Pure Nickel - You can obtain this a number of different ways. I bought my nickel in the shape of two 4oz plates on eBay for ~$5, a good components keep ought to have nickel welding rods, and most music outlets will carry Ernie Ball "Pure Nickel" guitar strings. Location https://nickelplatingnearme20875.wikigop.com/783232/nickel_plating_options