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.
Irish traditional music
Skilled craftsmen make fine custom whistles from a range of materials including not only aluminium, brass, and steel tubing but synthetic materials and tropical hardwoods; despite this, more than a few longtime professionals stick with ordinary factory made whistles.