These professional double-sided nail files are of the highestquality! Extremely durable and comfortable to use. They are made of Japanese abrasive paper characterised by longevity, durability and efficiency. These files can be washed and disinfected. The files are of varying coarseness/roughness, and Didier Lab offers the files in the two most popular forms: straight and halfmoon. The files with rough texture are designed for artificial nails, and the files of soft texture are intended for natural nails.