Hanak Bi & Tri Colour Indicator Nylon (30m Spools)
I use this a lot and usually I use half a spool at a time, for straight euro nymph leader.
Most people cant fish 15m of this as I do, but you can have 3 x 10m or 6 x 5m or just use it at the end of a choosen leader, either way it is very versatile.
Bi-Colour = 2 Colours Tri-Colour = 3 Colours.
Choose the Diameter and the Choice of Bi or Tri
I like the 0.25mm for windy days and on calm days the sensitivity of the 0.22mm can make the difference.