"These little jets are adorable. My son was so excited when he saw them, he's been playing with one for couple weeks now. It is not flimsy, perfect size to fit in a pocket to play with. I knew from reviews not to expect much from the whistle aspect. This is nothing more then a hole to blow through creating a sound like a dog whistle, very annoying! But I plan on using them to decorate an aircraft carrier cake. Totally worth it."