This listing is for one plastic door knob set with spindle, salvaged door handle, door hardware.
The knobs are hollow and made out of a molded plastic material which contains a threaded metal hole for the spindle. I don't believe the knobs are made of Bakelite, but from a hard plastic from the 1960's. They are tan or yellowish in color and one looks like it had been painted white and the paint has been worn down. I don't see any cracks. One knob is tight on the spindle and I couldn't unscrew it off.
Measurements: 5" long, including the spindle. The knobs are approximately 2" in diameter.