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Customer Questions

Where is this file made? Which country?

Bona Fide Beauty Glass Nail Files are made in The Czech Republic from 100% Genuine Czech Glass of the finest quality. Czech ‘Bohemian’ glass is a centuries old traditional form of glassmaking globally recognized for its superior craftsmanship & beauty. These are the real deal!

Is this file made of lead-free glass?

Yes, Bona Fide Beauty Czech Glass is 100% Lead-Free.

Do the files come with a protective sleeve?

Bona Fide Beauty Files either come with a protective plastic sleeve or plastic hard case, please check the Amazon listing carefully prior to making your purchase.

How long will the filing surface last?

Czech Glass Nail Files are very durable long lasting. If treated with care they can last you a number of years. The files are made from tempered (toughened) Czech Glass of the finest quality. The surface of the file is chemically etched so it won’t wear off like an emery board or other cheaper nail file alternatives.

In our experience, most customers choose to replace their files after 12 - 24 months, while others can have a glass files for 5+ years! As you continue to use your Glass File, the surface will feel smoother over time, but will still file the nail efficiently.

They are reusable, hygienic and easy to clean. They have a non-porous glass surface, which does not absorb water, thus preventing the growth of nasty bacteria & fungus. Whereas typical Metal Files & Emery Boards should be discarded after a few uses due to hygiene reasons & risk of nail infections.

What grit is the file?

Glass files do not conform to typical grit as grit is an ideal measurement for determining the roughness of sandpaper, or in the case of nail files, it refers to the roughness of metal and paper files. However, the roughness of Czech Glass Files cannot be easily compared with the roughness of paper or metal files. They are completely different surfaces. The main difference is that paper or metal files have grinding grains attached to the surface of the file, while glass files have grinding elements formed right out of the surface of the glass body.

We classify our standard range as Fine - Medium Grit, so they probably fall in the 240 - 180 grit category, leaning more towards the 240. They have a higher grit then most emery boards, but a lower grit then metal files, which are generally quite coarse & harsh on natural nails. When you run your finger along the abrasive surface it feels similar to that of a cat's tongue, I know it sounds unusual but it is surprisingly accurate.

We also have a fine grit range, this range features a slightly finer grit that our Standard Fine~Medium Grit range. The grit feels like soft glass, it does not feel abrasive at all, however, it is a high-quality file that efficiently files the nail. 

Our Standard & Fine Grit glass nail files suit most nail types, however, we recommend the fine grit range for people with particularly sensitive or delicate nails.

Please check our Website & Amazon listings if you are ever unsure.



Grit Guide for Metal Nail Files


900 - 12,000 Grit [Buffers]
 Smoothing and shining natural and artificial nails.


400 - 900 Grit [Extra Fine]
 Soft and normally is only used for finishing natural nails and not for shaping/filing. Useful for removing ridges, stains and polishing natural nails. Ideal for preparing all nail surfaces for buffing and shining.
240 - 400 Grit [Fine] 
Ideal grit for buffing natural nails to a smooth finish or buffing away stains. It is also recommended for use on fragile, weak or damaged nails. Ideal for finishing work on acrylics, wraps, and gels.


150 - 240 Grit [Medium]
 Good for lightly shaping the free edge of gels or acrylics. Sometimes used to lightly etch the natural nail in preparation for product.

 Grits higher than 220 are good for filing, shaping and smoothing acrylic nails as well as the free edge of natural nails. Please note, if you have weak or damaged nails then you should probably try a finer grit.


100-150 Grit [Coarse] Ideal for reducing the length of and shaping acrylics or gels

60 - 80 Grit [Extra Coarse]
 This grit is quite rough and should not be used on natural nails. A file this coarse should only be used on artificial nails. Good for shaping very thick or misshapen acrylics or gels.

How do I clean my glass nail file?
Simply rinse abrasive surface under running water & let the file dry out on a soft towel.

Can I sterilize the file with alcohol disinfectant?
Yes. We recommend a gentle disinfectant spray apply directly to the abrasive filing surface, always avoiding the decorated handle, then rinsed under running water.

For decorated files, avoid wetting the handles. Avoid exposing files to solvents, harsh disinfectants and high temperatures since the decoration may deteriorate in such conditions.

How often should I use my file?
It depends on how fast your nails grow. Bona Fide Beauty Czech Glass Files are designed for regular, long-term use. We recommend using them on a regular basis to file, shape and strengthen the nail.

The fine grit, permanently etched abrasive surface seal the natural keratin layers together at the nail's edge, leaving nails smooth & healthy.

Are these good for musicians?
Yes! These are perfect for musicians. We have heard wonderful things from some talented guitarists, pianist & harpists. Glass files are the perfect nail care tool for keeping your nails trim and smooth.

I am a nail technician, are these suitable for professional salons?
Absolutely! BFB Czech glass nail files are ideal for salon professionals. They can be washed and sterilized in-between uses.

Is it normal if my file squeaks as I file?

Yes, this is perfectly normal. It is caused by the friction between the glass and your nail.

When I file I can smell a odour, is this normal?

On rare occasions, some people experience a slight smell after filing, this is very normal.

As you file your nail, you are exposing bacteria that resides in the nail, plus you are creating a lot of friction between the glass file and nail. We recommend keeping your nails as clean as possible between filing.

Unfortunately there is no way to avoid this, however, you can mask the smell. We recommend using an organic air freshener or essential oil diffuser while you file.

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