Skein of spun coarse brown nettle thread.
https://trc-images.nl/collection_images/hires/2019/2019.1009b.jpg#\\TRC-SERVER\TRCSharedWork\TRC Database\collection%20photographs\2019.1000\2019.1009b.jpg#
The attached label states: '50 m Coarse Yarn 90 gr' and 'Used for floor mats.'