This Ultimate Precision Polishing File #10000-12000, is made from high-quality tempred glass which incorporates nano technology during the production process. It offers a superior filing exprerience and unparalleled buffing ability. This filing effet is comparable to sanding paper with 12000 grit. The file is designed with a single grain pattern that ensures smooth and uniform filing. This Ultimate Precision Nano Polishing Files are enable to approach the mirror- like finish throgh buffing. it can give you a next generation buffing exprerience. It is easily cleaned by washing,the product will never rust. with it own protecting case inside of the packaging. Sutiable for all types of plastic and wooden pieces, gunpla real grade, hg, pg, mg model kit, military, figure, resin gk, car and airplane kits. Caution: Please refrain from dropping the item to prevent any cracks that will render the product useless. recommended to store the item in the protective case after use to prevent any accidental damage. please do not file any metal items or materials not mentioned. if the filing experience feels sluggish and weak, please wash the file and remove any residual plastic to restore the effectiveness of the file. Caution: Please refrain from dropping the item to prevent any cracks that will render the product useless. recommended to store the item in the protective case after use to prevent any accidental damage. please do not file any metal items or materials not mentioned. if the filing experience feels sluggish and weak, please wash the file and remove any residual plastic to restore the effectiveness of the file.