A:
I use a Parker fountain pen so I have this cartridge in my drawer. It is exactly 3 inches long from tip to tip. The opening where the nib fits into the cartridge is 1/8 inch (measured across the opening) and the neck a little less than 1/4 inch measured the same way. The circumference at the "shoulder" or the widest point, is 7/8 inch.
Good luck!
Answered on 12/18/2009 by Aseret from Indianapolis, IN