## Common ground
All options refer to garbage can lids, regardless of material.
## Options at a glance
**3923.50 – Plastic material**
- **Defining trait:** Made primarily from plastic (e.g., polyethylene, polypropylene).
- **Typical examples:** White kitchen trash can lid, black outdoor compost lid, snap-on plastic bin cover.
- **Best fit when:** The lid is lightweight, molded, and not metallic; commonly used in homes or offices.
**8309.90 – Base metal**
- ** **Defining trait:** Constructed from iron, steel, or other base metals (non-precious).
- **Typical examples:** Heavy-duty steel trash can lid, industrial waste bin cover, rust-resistant metal lid.
- **Best fit when:** The lid is sturdy, metallic, and designed for heavy use or outdoor exposure.
## Key differences
| Feature | 3923.50 (Plastic) | 8309.90 (Base Metal) |
|------------------|--------------------------|----------------------------|
| Material | Plastic (non-metallic) | Iron, steel, or similar |
| Weight | Light | Heavy |
| Durability | Moderate (can crack) | High (resists impact) |
| Common use | Indoor, household | Outdoor, industrial |
## How to choose
- Is the lid made of plastic? → 3923.50
- Is it made of steel or iron? → 8309.90
## Overlaps & pitfalls
A lid could be partially metal and plastic (e.g., plastic body with metal rim), but the main material determines classification. If unclear, prioritize the dominant material. No option is vague—both are well-defined by material type