What characteristic prevents the Fox 40 whistle from rusting?

The Fox 40 whistle is designed with a plastic body, which is a key characteristic that prevents it from rusting. Unlike metal options, plastic does not corrode or oxidize, making it an ideal material for creating durable and long-lasting whistles. The use of plastic allows the whistle to maintain its integrity even in wet conditions or when exposed to moisture, ensuring that it remains functional over time. This attribute is particularly advantageous for outdoor activities where the whistle may be exposed to the elements.

In contrast, metal casings or aluminum finishes, while they may provide durability in some contexts, are susceptible to rust or corrosion if they are not treated or coated appropriately. Rubber seals are important for certain functionalities, but they do not play a role in preventing rust. Therefore, the plastic body is the primary reason the Fox 40 whistle is resistant to rust and suitable for various environments.