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.
Tin whistle
The standard range of the whistle is two octaves. For a D whistle, this includes notes from D to D; that is, from the second D above middle C to the fourth D above middle C. It is possible to make sounds above this range, by blowing with sufficient force, but, in most musical contexts, the result will be loud and out of tune due to a cylindrical bore.