## Common ground
All options describe ring binders made from different primary materials.
## Options at a glance
**3926.10 – Made of plastic material**
- **Defining trait:** Constructed primarily from synthetic polymers like polypropylene or PVC.
- **Typical examples:** Clear plastic binders, durable office binders with rigid covers.
- **Best fit when:** The binder has a non-paper, flexible or rigid plastic shell and rings.
**4820.30 – Made of paper or paperboard**
- **Defining trait:** Constructed primarily from paper-based materials, often with a cardboard-like core.
- **Typical examples:** Standard school binders, loose-leaf notebooks with paper covers.
- **Best fit when:** The binder’s cover and spine are made of paper or thick paperboard.
## Key differences
| Feature | 3926.10 (Plastic) | 4820.30 (Paper/Paperboard) |
|---------------------|--------------------------|----------------------------|
| Primary material | Synthetic plastic | Paper or paperboard |
| Durability | High, water-resistant | Moderate, less durable |
| Weight | Lighter to heavier | Light |
## How to choose
- Is the binder made mostly of plastic (e.g., clear, rigid, flexible)? → 3926.10
- Is the binder made mostly of paper or cardboard (e.g., matte finish, foldable)? → 4820.30
## Overlaps & pitfalls
A binder with a plastic cover and paper pages may still fall under 3926.10 if the *main structure* is plastic. The key is the dominant material of the binder’s body and rings. If unclear, prioritize the material forming the outer shell and binding mechanism. No option is inherently more correct—choose based on the product's primary construction material