The Pike upgrade works similarly to the Long Bow upgrade. The difference between spears and pikes is that the unit can battle back with 2 additional dice.
The archive includes both the Specialist card and the Pike Weapon card.
These cards are designed to be printed on cardstock and will create bridge-sized cards when printed. I suggest after cutting out the card, trace a battlelore card over the printed card and trim to size.
You can also upload them to The Game Crafter and print using their bridge-sized card option.