I don't know about this set in particular but I guess bowman chrome includes cards with real and printed signatures. The sellers pictures don't really help.
Here is a post I found talking about the difference-
http://prospectforprofit.com/?p=921
So blue ink is a true signature and black is printed?
printed example
http://www.ebay.com/itm/2007-Bowman-...item19ceb7d4df
real example
http://www.ebay.com/itm/Joba-Chamber...item2c63ccede4