3lb Maxima nylon green. Strong, stiff enough to help turnover but not too stiff to 'kill' the fly and cheap enough not too worry about useage.
Takes a rub from yer leader sink stuff (fullers earth and fairy liquid) and because of it's colour isnae too shiny. Knot strength good as well.
Suspect strength is greater than the marked 3lb though and isn't often i suffer breakages (10lb lively clean salmon off the Tummel last year and a string of thumping broonies over the years as proof) although it isn't infallable though.
Wee spool of double strength stuff for times when really spooky troot's turn their noses up and i suspect the nylon at fault. If it still dosen't work and wee flees and new nylon still not working then just chuck some stones in and go home.
Allan