Nature’s Spirit Synthetic Yak Hair is an extra-long fiber coming in at 24 inches in total length, and is made to withstand predatory fish. It is a strong material that is stiff enough to keep its shape, but limber enough to have fluid movement when dancing in the water. NS Synthetic Yak Hair also takes marker well for any form of barring one needs. Perfect for pike, bass, salt water, baitfish, and any streamer pattern one desires.