2" Natural Buffalo Horn Bone Hairpipe. These are first Quality bone. This is a very popular trade item. Carried by the Lewis and Clark expedition, the Northwest Co. and Auguste Chouteau as trade goods. Bone hairpipe appeared around 1880, after a trader among the Pocas discovered that the bone pipe stems from corn cob pipes were in demand as hairpipe. Pack of 25 2" Natural Buffalo Horn Bone Hairpipe. These are first Quality bone. This is a very popular trade item. Carried by the Lewis and Clark expedition, the Northwest Co. and Auguste Chouteau as trade goods. Bone hairpipe appeared around 1880, after a trader among the Pocas discovered that the bone pipe stems from corn cob pipes were in demand as hairpipe. Pack of 25