Semenawa palm hemp
This is palm hemp twine, known as 'shuronawa', which you will often see in Japanese gardens binding fences and the like.
Kinbaku fans will see its potential for semenawa sessions as it is is very mean, prickly and thin. It is a 2-ply 3mm twine which is very rustic and is supplied in standard 8m lengths finished with a standard knot.