## Common ground
All options describe litter boxes made from different primary materials.
## Options at a glance
**3926.90 – Plastic**
- **Defining trait:** Made primarily from synthetic plastic, often lightweight and easy to clean.
- **Typical examples:** Disposable trays, self-cleaning models, basic enclosed boxes.
- **Best fit when:** Durability, low cost, or ease of cleaning is prioritized.
**4016.99 – Rubber**
- **Defining trait:** Constructed from flexible, durable rubber (e.g., natural or synthetic), often used for non-slip bases or soft components.
- **Typical examples:** Rubber mats under litter boxes, rubber-lined trays, pet-safe anti-slip pads.
- **Best fit when:** The product includes a rubber base or non-slip feature, not the main box structure.
**4421.9X – Wood**
- **Defining trait:** Made from solid or engineered wood, often with a natural aesthetic and higher perceived quality.
- **Typical examples:** Handcrafted wooden boxes, rustic-style litter stations, eco-friendly designs.
- **Best fit when:** The product is primarily wooden and designed for style or sustainability.
## Key differences
| Feature | Plastic (3926.90) | Rubber (4016.99) | Wood (4421.9X) |
|------------------|-------------------|------------------|----------------|
| Material type | Synthetic plastic | Flexible rubber | Natural/processed wood |
| Primary use | Main box structure | Base or accessory | Main box structure |
| Durability | Moderate to high | High (flexible) | Moderate (can warp) |
## How to choose
- Is the litter box mainly made of hard, molded plastic? → 3926.90
- Does it use rubber for non-slip or cushioning parts (not the main structure)? → 4016.99
- Is it primarily built from solid or crafted wood? → 4421.9X
## Overlaps & pitfalls
A litter box with a wooden frame and plastic tray may fit both 3926.90 and 4421.9X. The main material determines the code—use the dominant structural material. Rubber is rarely used for full boxes; if present, it’s likely an accessory. If unclear, prioritize the **main structural material**