Hi, 911fan.
A "2" is a regular (coarser in caliber) two haired graft.. A "fine 2" is a finer (in caliber) two haired graft. "Fine 1 or F1" and "Fine 2 or F2" grafts are carefully picked out to give that natural feathering of the hairline so patients won't have that strong unnatural result. Please let me know if you have other questions.