You will receive 4 inches of antique Barbary Ostrich quills when you purchase this item. Some call this the Holy Grail, as it is assumed not to exist anymore. This is dense herl, superb stuff, suitable for hook sizes from size 10 and up.
These quills are from the Victorian era. The Barbary Ostrich was special, in that the fibres on its herls are much denser than the modern common Ostrich. Barbary Ostrich was extremely popular in the old days, and obviously, the herl of choice for fly dressers.