Nickel has the unusual properties of being hard — strong, able to withstand breaking under high forces — and ductile — able to yield or bend before breaking or cracking. In addition, nickel is chemically similar to iron but with particularly good resistance to oxidation.

Polished cast nickel itself is not inherently toxic, but it can pose some health risks, primarily due to potential allergic reactions and the fact that some forms of nickel are carcinogenic, especially when inhaled as dust. While polished cast nickel may be less likely to cause issues than certain other forms, it's important to be aware of the potential risks, especially for individuals with sensitivities or allergies.