The imitation of inferior quolity is a sold thigs,but a shape is sasy to imitate any product as a simple thing.
I watched WEB and found it. ewhistles.com
I add a postscript to word, term, person's name etc about the whistle at any time
When the whistle keeps it intact after use, saliva hardens and becomes the thin film. Then I can graze a sound, and let's do care after the use because we may become small.