Everyone I tested works and has ink or graphite. I have not tested them all though. There are aluminum, plastic vectors, etc. Some are barely used and some have been used a few times. A bunch of advertising and commercial pieces from production for those businesses. I bought them at the estate of a former employee from right here in Janesville, WI!! Parker Pens headquarters! Vintage Parker Pen Collection W/ Mechanical Pencils 100+ PCS *All Working*.