Well known and loved by competition fly anglers.

According to the manufacturers GTMis described as follows:

STROFT GTM is the most successful fishing line worldwide
due to its outstanding qualities. High tensile strength and
optimum elasticity and suppleness have made this line
an absolute favourite amongst anglers of all persuasions,
seeking a reliable line for premium applications.
The line is particularly appreciated amongst fly fishermen as
leader and tippet material.

The 25m spools can be fitted with Stroft Cutting Rings to make it easier to cut lengths of tippet: