封面雷射，兩側密封，可垂直或水平使用，非常適合存放重要文件。
提供OEM設計，內頁可存放A4尺寸，五層設計分類管理更方便。
The cover is laser-engraved, sealed on both sides, and can be used vertically or horizontally, making it ideal for storing important documents.
OEM design is available, the inner pages can store A4 size, and the five-layer design makes classification and management more convenient.
