## Common ground
All options describe protective cases for microscopes, differing only in material composition.
## Options at a glance
**3926.90 – Made of plastic**
- **Defining trait:** Constructed primarily from synthetic polymer materials like polypropylene or ABS.
- **Typical examples:** Hard-shell plastic storage boxes with foam inserts.
- **Best fit when:** The case is rigid, lightweight, and resistant to moisture or impact.
**4202.9X – Made of leather or composite materials**
- **Defining trait:** Features outer layers of leather, synthetic leather, fabric, or paperboard, often with decorative or soft-touch finishes.
- **Typical examples:** Premium travel cases with padded interiors and zipper closures.
- **Best fit when:** The case emphasizes aesthetics, portability, or luxury feel (e.g., for museum or field use).
**4420.90 – Made of wood, marquetry, or inlaid wood**
- **Defining trait:** Crafted from solid wood or intricate woodwork; may include decorative inlays or veneers.
- **Typical examples:** Antique-style display cases or museum-grade storage with carved details.
- **Best fit when:** The case is ornamental, historically significant, or used for display rather than transport.
## Key differences
| Feature | 3926.90 (Plastic) | 4202.9X (Leather/Composite) | 4420.90 (Wood) |
|------------------|-------------------|-------------------------------|----------------|
| Material base | Synthetic plastic | Leather/fabric/paperboard | Solid wood |
| Durability | High impact resistance | Moderate, flexible | High (if well-made) |
| Aesthetic focus | Functional | Stylish, portable | Ornamental |
## How to choose
- Is the case primarily made of rigid plastic? → 3926.90
- Does it use leather, fabric, or soft materials on the surface? → 4202.9X
- Is it made of solid wood or decorative woodwork? → 4420.90
## Overlaps & pitfalls
A case may combine materials (e.g., wooden frame with plastic lining), but the **primary material** determines classification. If unsure, prioritize the dominant structural material. No option is vague, but “composition leather” in 4202.9X may be confused with real leather—clarify if needed