Packing Info pertaining to our ski boat applications:
FLAX - old school wax and "other stuff" common through early 80's, 1-3 seasons at best (made for industrial valves)
Graphite - much better, but nasty on the hands, 2-4 seasons
PTFE /TEFLON - better than Graphite, best value, 3-5 seasons
GTO - This is the genuine Gore with PTFE, and Graphite mixture, will have 100% GFO stamped on braid - Don't know how long this really lasts, best I've seen so far. (rated for up to 15,000 shaft RPM)
GTU - This is the knock-off similar product to GTO, packaged by Western Pacific Trading Co.
To save my customers $$ I buy in bulk rolls and cut to length, & place in a simple plastic zip-lock bags. I carry the Teflon, and will have GTO on the parts site by the week-end.