Mknana 4 Tier Mesh File Tray, Stackable Paper Tray, Desk Organizers And, Black. This Desk Tray Organizer is no need for complex assembly, it can simply be stacked together and used according to the instructions. Modular design, a set of products have four trays, four trays can be used alone, can be stacked in pairs, or can be stacked together, if the purchase of multiple sets of Stackable Trays, you can have more options. This office organizer is made of durable metal mesh for long-lasting reliable strength.The durable, powder coat finish helps resist chipping or scratching while the metal mesh design promotes air flow to help reduce dust buildup. Office trays help keep desktop accessories clean and organized, such as letters /A4 paper, folders, books, magazines, stationery, etc If there is any problem with the office supplies, please feel free to contact us, from refund to replacement, we will handle it for you in time.