Glass files, also known as crystal files, regardless of how they are used, seal the keratin layers together at the edge of the nail, preventing peeling and chipping. Traditional files should be used by filing in one direction only, but they rarely are, and filing in both directions causes the layers of keratin to shred, leaving the edge thinner and more prone to peeling and chipping. Another bonus is that glass files can be sanitized and sterilized. And they're great for professional use. Color may vary slightly.
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