The whistle is made of rolled stainless steel with a stainless steel chain, so that it may not rust. The chain can be inter-changeable for the whistler’s desire (beaded necklace or the 30’ chain may be cut for desired length).
It doesn't take much air to whistle loudly with the Hart Tew Whistle. The Whistle has 2 holes in the top and bottom. When you put the whistle in your mouth you should block the inside of whistle with your tongue so the air you push through the whistle goes through the holes on the top and bottom of the whistle.
The Hart Tew Whistle has a distinctive sound and will make people turn their heads to see what's going on.