This metal sphere uses 3 color mokume - layered nickel, brass and copper - as its base metal. The patterns it brings out as you create a sphere from it are flat out killer! This one has already been handled well so that the colors show up really nicely (they can be shiny when first made and actually need hand oils to create this beautiful patina on the metals). It's a beautiful example of one the coolest metals around, and a rare opportunity for a piece like this!