This item is roughly 100 years old. It will have rust and is sold for parts, I have a leaven available, you get only one set per purchase. They are probably some sort of metal, not brass though since there is rust I’m assuming. But I’ve see someone clean these up and they look amazing. Just these were extra so just selling them as not needed and are extra.

This vintage door knob set features a two-sided design made of brass or metal. The beautiful color and sturdy material make it a great addition to any home decor. It comes with a spindle and is available for free shipping. Ideal for anyone looking to enhance the look of their doors with a touch of antique elegance.