Fishhawk Size A bright nylon
100m spool, thread diameter 0.18mm approximately. A spool is are sufficient for 2+ rods.
For a wider choice of colours in size A medium-fine thread, see Tire and YLI 50wt silk listed separately. Finer 100wt silk and heavier guage 30wt silk also available.
Thread colours will also darken when thread finish is applied (unless the threads are first sealed with multiple coats of colour preserver). If using light colours they tend to go transparent especially over a dark blank, and the blank colour will dominate.