The short position in a US Treasury bond futures contract can select among many different eligible (maturity greater than 15 years) bonds for delivery. This is by design; the Fed and Treasury do NOT want to see a "run on the issue" if only one bond can be delivered. The conversion factor puts the eligible bonds on a level playing field, making the short almost (but not quite) indifferent to which bond is delivered. For more financial risk videos, visit our website! http://www.bionicturtle.com