The secret to beautiful, healthy-looking nails is in the crystals - Ruby Crystals that is! Our multi-functional Ruby Crystal Ceramic Stone Nail File is made of thousands of synthetic ruby crystals bonded together to form a unique surface for shaping and maintaining perfectly-manicured nails. Ruby Crystal Ceramic Stone Nail File Features: Can file in both directions - won't cause tiny microscopic tears on the tips of nails like conventional nail files. Beneficial ruby crystal dust - helps prevent splitting the tips of your nails as you file. Rounded tip - remove burrs, dirt and stains from nails. Flat area near the tip - helps to easily remove excess skin around the cuticle. Groove that runs the length of the file - specially designed for shaping of longer fingernails. Plastic, pointed end - great for cleaning dirt and debris from underneath fingernails. Made in USA.