## Common ground
All options are capacity measures (containers for measuring volume), differing only in material.
## Options at a glance
**4421.99 – Made of wood**
- **Defining trait:** Constructed primarily from wood, often used for traditional or rustic storage.
- **Typical examples:** Wooden barrels, wooden jugs, wooden measuring cups.
- **Best fit when:** The container is visibly made of solid or staved wood, not coated or lined with metal/plastic.
**6911.10 – Made of porcelain or china**
- **Defining trait:** Crafted from fired clay with a glazed, non-porous surface; typically decorative or fine-use.
- **Typical examples:** Porcelain measuring cups, china beakers, ceramic kitchen scales.
- **Best fit when:** The item is glazed, brittle, and has a smooth, glossy finish typical of high-fired ceramics.
**6912.00 – Made of ceramic**
- **Defining trait:** Made from unglazed or coarsely glazed clay; often more utilitarian than porcelain.
- **Typical examples:** Earthenware jugs, rough ceramic measuring pots, terracotta containers.
- **Best fit when:** The material is porous, matte, or visibly coarse (not glossy), and not fired to porcelain hardness.
**7013.10,7013.4X – Made of glass**
- **Defining trait:** Transparent, non-porous, and typically used for precise volume measurement.
- **Typical examples:** Glass beakers, graduated cylinders, clear measuring jugs.
- **Best fit when:** The container is transparent and allows visual reading of liquid levels.
**7323.9X,7326.90 – Made of iron or steel**
- **Defining trait:** Metallic construction; often heavy-duty and resistant to breakage.
- **Typical examples:** Steel pails, iron measuring cans, industrial containers.
- **Best fit when:** The material is metallic, magnetic, and visibly strong or industrial.
**8007.00 – Made of tin**
- **Defining trait:** Thin, malleable metal; often used for lightweight or food-grade storage.
- **Typical examples:** Tin cans, tin measuring cups, old-fashioned tins.
- **Best fit when:** The container is made from thin, non-magnetic (or weakly magnetic) sheet metal, typically with a matte or brushed finish.
## Key differences
| Material | Transparency | Surface Finish | Durability | Typical Use |
|----------------|--------------|--------------------|----------------|----------------------|
| Wood | No | Natural grain | Moderate | Rustic, home use |
| Porcelain/China| Yes | Glazed, glossy | Brittle | Kitchen, decorative |
| Ceramic | No | Matte, porous | Moderate | Utility, garden |
| Glass | Yes | Smooth, clear | Fragile | Lab, precise measure |
| Iron/Steel | No | Metallic, rough | High | Industrial, heavy-duty |
| Tin | No | Dull, malleable | Low to moderate| Food storage, vintage |
## How to choose
- Is it transparent? → 7013.10,7013.4X
- Is it glazed and glossy? → 6911.10
- Is it coarse or porous with a matte finish? → 6912.00
- Is it made of wood? → 4421.99
- Is it metallic and heavy? → 7323.9X,7326.90
- Is it thin, malleable metal (not steel/iron)? → 8007.00
## Overlaps & pitfalls
- Glass and porcelain both can be transparent; use "glazed" vs. "clear" to distinguish.
- Tin and steel may look similar; tin is softer and less magnetic.
- Ceramic and porcelain are both fired clay—priority goes to surface finish (glazed = porcelain).
- No clear priority rule given; choose based on the product’s **main material and defining feature**