The description says 304 stainless steel, but when I opened the box I noticed something not right about the color of the nails. I then tested with a magnet and the nails jumped at it like a mild steel nail would. These have TOO MUCH ferrous metal to be 304 stainless. They act more like silver painted mild steel nails. They are a bit over priced to begin with and considering the quality of the stainless, they are a ripoff.