## Common ground
All options are feeding bottle teats or nursing nipples used for infant feeding.
## Options at a glance
**3924.90 – Made of plastic material**
- **Defining trait:** Constructed primarily from synthetic plastic (e.g., polypropylene, silicone).
- **Typical examples:** Silicone teats, BPA-free plastic teats, soft rubber-like plastic nipples.
- **Best fit when:** The product is rigid or semi-rigid, lightweight, and commonly used in modern bottles with anti-colic features.
**4014.90 – Made of rubber**
- **Defining trait:** Manufactured from natural or synthetic rubber, typically softer and more elastic than plastic.
- **Typical examples:** Traditional latex teats, older-style rubber nipples, soft stretchy feeding tips.
- **Best fit when:** The product feels soft and flexible, often used in classic bottle designs or for babies sensitive to plastic.
## Key differences
| Feature | 3924.90 (Plastic) | 4014.90 (Rubber) |
|---------------------|--------------------------|----------------------------|
| Material | Synthetic plastic/silicone | Natural/synthetic rubber |
| Flexibility | Moderate to high | High (more elastic) |
| Durability | Higher | Lower (prone to wear) |
| Common use | Modern, anti-colic bottles | Traditional, classic designs |
## How to choose
- Is the teat made of silicone or hard plastic? → 3924.90
- Does it feel soft and stretchy like rubber? → 4014.90
## Overlaps & pitfalls
Some products (e.g., silicone teats) may be mistaken for rubber due to softness, but silicone is a plastic polymer and falls under 3924.90. The key distinction is material type: if it’s rubber (especially latex), use 4014.90; otherwise, use 3924.90. No option takes priority—choose based on the **primary material**