Tarred hemp housing

Classic thin twine for caulking and knot tying.
Made from the fine threads of the hemp plant, coated with tar.

Comes in rolls.

Tarred cordage has been used for centuries aboard sailing ships for rigging, caulking, and knot tying, as well as for tying ratlines and hanks.
In Scandinavia especially, the twine made from two yarns tarred caulk (Dansk Merling) is used for fancy work.