All of grinding heads are made of premium material, these grinding heads are sturdy enough for your usage. The grinding heads set are nail art tools that are applicable for nail drill machine. Suitable for natural nails as well as artificial nails, great tools for any professional manicurist or beginner. Features -Material: Refined steel. Silica gel. Quartz. ceramic - Wide application range, suitable for all and pen-type nail polishers. - The polishing head has multiple models, multiple specifications, and complete functions. - Made of high-quality materials, can be used interchangeably, reverse use. - It has the functions of grinding nails, removing nails to remove dead skin, carving arcs, etc. - Alloy tungsten steel material, with high wear resistance, high impact resistance, high temperature resistance.