Small spectra/amsteel. Crystalline 3mm works well also. Keep an eye on the knots and any chafe points. I eye spliced some spectra on both ends on my 6.0 once I got the height of the pole correct... but some people like to have the option of adjusting it. I am using crystalline for the bridles on the HT because it makes tying/untying knots easier than if it were just spectra.
