Flax filaments are bast strands from the tail of the plant Linum usitatissimum. In the flax plant, the filaments are organized in heaps of 12–40 strands. These groups are up to 100 cm long and 15–20 µm in width. Flax filaments are mostly polygonal in cross-segment, brought about by how they are stuffed together in packs.
Every extreme fiber is pointed at the two finishes, and there is a little lumen running the long way however vanishing close to the closures. The strands have a smooth surface besides at spans where they are ringed with cross over hubs.