What material is commonly used to construct disposable nail files?

Disposable nail files are commonly made from cardboard because it provides an effective and economical way to serve the purpose of nail care while also being lightweight and easy to handle. Cardboard can be treated to achieve different textures that cater to various filing needs, such as shaping or smoothing nails. Additionally, cardboard is cost-effective for salons since they can use it for single-use purposes, thereby maintaining hygiene and preventing cross-contamination between clients.

Materials like plastic, metal, and wood, while used for other types of nail tools, do not lend themselves to single-use applications as effectively as cardboard. For example, plastic can be used for reusable files which would not be considered disposable, and metal files can be challenging to sanitize and are typically designed for repeated use. Wood is sometimes used in some types of nail tools, but it is not as widely used for disposable files given considerations about maintenance and sanitation.