## Common ground
Both options are types of roof gutters and conduits used to channel rainwater away from buildings.
## Options at a glance
**6906.00 – Made of ceramic**
- **Defining trait:** Constructed from fired clay or similar non-metallic, heat-resistant material.
- **Typical examples:** Traditional terracotta gutters, decorative ceramic downspouts.
- **Best fit when:** Aesthetic appeal, historical architecture, or resistance to corrosion in non-industrial settings is prioritized.
**7308.90,7326.90 – Made of iron or steel**
- **Defining trait:** Fabricated from ferrous metal, often galvanized or coated for durability.
- **Typical examples:** Galvanized steel gutters, corrugated iron downpipes, industrial-grade systems.
- **Best fit when:** Long-term strength, heavy-duty use, or cost-effective installation in modern construction is needed.
## Key differences
| Feature | 6906.00 (Ceramic) | 7308.90,7326.90 (Iron/Steel) |
|------------------|-------------------------|-------------------------------|
| Material | Fired clay | Metal (iron/steel) |
| Durability | Moderate (brittle) | High (impact and weather-resistant) |
| Corrosion resistance | Excellent (non-metallic) | Good (if coated/galvanized) |
| Aesthetic use | High (decorative) | Low (industrial look) |
## How to choose
- Is the material primarily clay or fired ceramic? → 6906.00
- Is the product made of galvanized, coated, or bare iron/steel? → 7308.90,7326.90
## Overlaps & pitfalls
Ceramic gutters may be used in modern homes for style, but their fragility limits use in high-impact areas. Steel gutters can be painted to mimic ceramic, but this doesn’t change the material classification. The main function (water channeling) is shared, so priority should be given to **material composition**—the defining trait