## Common ground
All options are pet cages, designed to contain and house small animals like rabbits, guinea pigs, or birds.
## Options at a glance
**4421.99 – Made of wood**
- **Defining trait:** Constructed primarily from wood, offering natural aesthetics and insulation.
- **Typical examples:** Wooden rabbit hutches, wooden birdcages with wooden frames.
- **Best fit when:** You need a warm, natural look; the pet is sensitive to metal; or you want lightweight, easy-to-modify housing.
**7323.9X – Made of iron or steel**
- **Defining trait:** Built from metal (iron/steel), providing high durability and resistance to chewing.
- **Typical examples:** Metal dog kennels, steel rabbit cages with welded frames, industrial pet enclosures.
- **Best fit when:** Long-term use, heavy-duty needs, or pets that chew through materials.
## Key differences
| Feature | 4421.99 (Wood) | 7323.9X (Iron/Steel) |
|------------------|----------------------|--------------------------|
| Material | Wood | Iron or steel |
| Durability | Moderate | High |
| Resistance to chewing | Low (can be chewed) | Very high |
| Weight | Lighter | Heavier |
## How to choose
- Is the cage made of wood? → 4421.99
- Does it use iron or steel as the main material? → 7323.9X
## Overlaps & pitfalls
A cage may combine both materials (e.g., wooden frame with metal mesh), but the HS Code depends on the **primary structural material**. If unclear, prioritize the dominant material by weight or function. No option is vague—both are clearly defined by material