What materials are classified as non-single use nail files?

Non-single use nail files are materials that can be cleaned and sanitized for repeated use rather than being discarded after one use. Metal, glass, or crystal files fit this classification because they are durable and can withstand the cleaning processes required to ensure they are hygienic.

These materials are typically non-porous, meaning they don't absorb bacteria or moisture, making them ideal for multiple uses. Additionally, they can be sterilized effectively, ensuring that no harmful residue remains between clients.

In contrast, the other materials previously mentioned, such as wood, paper, plastic, and disposable options, are designed for single use or do not allow effective cleaning, which restricts their utility in a professional setting where hygiene is paramount. The ability of metal, glass, or crystal files to be sanitized ensures they maintain the necessary safety standards in a nail salon environment.