There are no words for this product...this is the best thing that has entered my life recently! Made a huge diff in my nails and I am telling you all...DO NOT buy regular nail files from the store, this is much smoother and you only file lightly going in one direction. Life saver/Nail Saver and I will always buy OPI crystal Nail file. It is daunting looking for a legit crystal/glass file but this is THEE ONE.