... shape. 5. The surface of the permanent glass nail file is either “etched” or “coated” according ... crystal nail file. Just enjoy filing your nail with glass nail file! Product Specifications: Crystal nail file, permanent glass nail ... nail fileMaterialStandard glass, crystal/toughened glass, acrylicGlass thicknessNormally 3mmTechSand blasting, etchedGrit No180/220/240/320/400 etcStyleColorful designed, ...