OPI are currently one of the biggest manufacturers of nail products and are known worldwide. They sell in over 103 countries and are constantly expanding. Also they research into trends and release collections and core shades to fit the trends. All of their products are equally high quality and fit the exact same standard. They sell over 55,000,00 bottles of lacquer and treatments each year which stands to prove the success and demand of their products. OPI are constantly expanding their already huge portfolio by adding new core shades, collections, treatments and tools. Like this Crystal Glass file which is a high quality re-usable file. Abrasive surface is etched into the file so you don't need to worry about the file being worn down. It is ideal for use on natural nails. This file will not cause your natural nails to start chipping or peeling. The nail file can be sanitized or cleaned before every use. To get the best results from the crystal nail file dampen it before use.