## Common ground
All options are types of document or file shelves, used for organizing and storing papers or files.
## Options at a glance
**4421.9X – Made of wood**
- **Defining trait:** Constructed primarily from wood, often with natural grain appearance and traditional joinery.
- **Typical examples:** Wooden filing cabinets, pine file shelves, solid oak document stands.
- **Best fit when:** The shelf is visibly made of wood, has a natural finish, or is used in homes, offices with classic decor.
**8304.00 – Made of base metal**
- **Defining trait:** Built from non-precious metals like steel, iron, or aluminum, typically durable and industrial in look.
- **Typical examples:** Steel filing cabinets, metal desk organizers, industrial file racks.
- **Best fit when:** The shelf is metallic, heavy-duty, corrosion-resistant, or used in commercial/industrial settings.
## Key differences
| Feature | 4421.9X (Wood) | 8304.00 (Base Metal) |
|------------------|----------------------|--------------------------|
| Material | Wood | Steel, iron, aluminum |
| Appearance | Natural grain, warm | Industrial, sleek |
| Durability | Moderate | High |
| Common use | Homes, traditional offices | Offices, factories, warehouses |
## How to choose
- Is the shelf made of wood (e.g., pine, oak)? → 4421.9X
- Is it made of steel, iron, or aluminum? → 8304.00
## Overlaps & pitfalls
A shelf may combine wood and metal (e.g., wooden panels on a metal frame), making classification ambiguous. In such cases, the **main structural material** determines the HS Code. If unclear, prioritize based on the product’s primary function or dominant material—no rule is given, so use the most defining feature