## Common ground
All options are frames or mounts designed to hold and display photographic slides.
## Options at a glance
**3926.90 – Made of plastic material**
- **Defining trait:** Constructed from synthetic polymer materials, typically durable and lightweight.
- **Typical examples:** Clear acrylic slide holders, injection-molded plastic mounts.
- **Best fit when:** The frame is rigid, transparent, and resistant to breakage or moisture.
**4823.90 – Made of paper or paperboard**
- **Defining trait:** Fabricated from cellulose-based materials, often thin, foldable, and biodegradable.
- **Typical examples:** Cardboard slide mounts, paper sleeves for archival storage.
- **Best fit when:** The frame is lightweight, low-cost, or intended for temporary or archival use.
## Key differences
| Feature | 3926.90 (Plastic) | 4823.90 (Paper/Paperboard) |
|------------------|--------------------------|----------------------------|
| Material | Synthetic polymer | Natural fiber (wood pulp) |
| Durability | High | Low to moderate |
| Transparency | Often clear | Opaque or semi-opaque |
| Use case | Display, long-term use | Storage, short-term use |
## How to choose
- Is the frame made of a rigid, transparent plastic? → 3926.90
- Is it made of cardboard or folded paper? → 4823.90
## Overlaps & pitfalls
A slide mount could be partially plastic and partially paper (e.g., plastic insert in paper frame), but the primary material determines classification. If unclear, prioritize the dominant structural material. No option is vague—both are well-defined by material type