封面雷射，两侧密封，可垂直或水平使用，非常适合存放重要文件。
提供OEM设计，内页可存放A4尺寸，五层设计分类管理更方便。
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.
