Shepherd's whistle
They are also produced commercially. Simple whistles may cost less than 1 USD in bulk; expensive ones may be quite ornate. They are commonly made of plastic, aluminum, stainless steel, silver, brass, titanium, Corian, jade, buffalo horn and other materials.
Low whistle
The low whistle, or concert whistle, is a variation of the traditional tin whistle/pennywhistle, distinguished by its lower pitch and larger size. It is most closely associated with the performances of British and Irish artists such as Finbar Furey and his son Martin Furey, Old Blind Dogs, Michael McGoldrick, "Riverdance", Lunasa and Davy Spillane, and is increasingly accepted as a feature of Celtic music. The low whistle is often used for the playing of airs and slow melodies due to its haunting and delicate sound. However, it is also becoming used more often for the playing of Irish and British jigs, reels and hornpipes, it being easier to produce some ornamentation on the whistle, due to the size of the finger holes.