: Use a piece of paper about 1 inch wide and 5 inches long (though exact size isn't crucial).
Making a paper "screamer" is a simple DIY project that uses air vibration to create a loud, high-pitched noise. No software download is required, as it only uses basic physical materials. How to Make a Paper Screamer Screamer Free Download
If you want a "screamer" that makes a loud bang rather than a high-pitched whistle, you can follow a Paper Popper tutorial which typically uses a full sheet of A4 or printer paper. Printable Templates and Resources : Use a piece of paper about 1
You can create this loud toy in seconds using a small scrap of paper. How to Make a Paper Screamer If you
: If you have a 3D printer, you can download free "screamer" whistle files from sites like Thingiverse.