Which is NOT a commonly used product in nail services?

In the context of nail services, hair gel is not a commonly used product. Nail services typically focus on enhancing and caring for the nails and the skin around them. Products like base coat, pumice powder, and cuticle cream are essential components of nail care routines.

A base coat serves as a foundation for nail polish, promoting adherence and protecting the nails from staining. Pumice powder is often used during pedicures to help exfoliate and smooth the feet. Cuticle cream is essential for moisturizing and nourishing the cuticles, which are critical for maintaining healthy nail beds and preventing hangnails.

Hair gel, on the other hand, is designed for hairstyling purposes and does not have any relevance in nail care or services, making it the product that does not belong in this list.