The sapphire nail file from the Twinox Instruments series is made of corrosion-proof stainless steel. It is made of a hardened sheet steel incorporating grinding grains. The matt satin finished of the Zwilling sapphire nail file stands out from the crowd. Its hygienic surface can be wonderfully cleaned. Show off your perfectly manicured nails at all times with a regular professional manicure with this hard-wearing file.