Stroft GTM nylonlina

The best monofilament! Available in both 25- and 100 meter spools and a bunch of different dimensions.

Stroft GTM is a monofilament tippet or leader material made from polyamide alloy and has a near transparent clear-blue-grey colour. According to Stroft, it's "the most successful fishing line worldwide" and is both strong and soft - hence the name "Stroft". In fact, it seems to be particularly strong for its diameter and feels much more supple than some other tippet materials, so it can be a particularly good choice in certain fly fishing situations.

The GTM part of its name comes from the German phrase "Getempertes Monofil" which means "tempered monofilament". Basically, it undergoes a really clever heat treatment process, along with some similarly complicated chemistry stuff. Stroft's boffins say this has helped it improve breaking strain, hardness, smoothness, elastic limit, stretchiness, feedback, memory and softness, among other things.