## Common ground
All options are shoe trees or moulds used to maintain the shape of shoes.
## Options at a glance
**3926.90 – Made of plastic material**
- **Defining trait:** Constructed from synthetic polymer materials, often lightweight and moldable.
- **Typical examples:** Disposable plastic shoe trees, flexible foam inserts, molded polyethylene forms.
- **Best fit when:** The product is lightweight, mass-produced, or designed for temporary use (e.g., in retail packaging).
**4417.00 – Made of wood**
- **Defining trait:** Crafted from natural wood, typically solid and durable with a traditional aesthetic.
- **Typical examples:** Wooden shoe trees for dress shoes, hand-carved cedar or beech models.
- **Best fit when:** The product emphasizes durability, breathability, and classic craftsmanship (e.g., for leather shoes).
**7323.9X – Made of iron or steel**
- **Defining trait:** Constructed from metal, usually rigid and heavy-duty, often with adjustable features.
- **Typical examples:** Metal shoe stretchers, industrial shoe formers, adjustable steel shoe trees.
- **Best fit when:** The product is designed for heavy use, shaping tough materials, or requiring structural strength (e.g., in repair shops).
## Key differences
| Feature | 3926.90 (Plastic) | 4417.00 (Wood) | 7323.9X (Metal) |
|------------------|-------------------|----------------|-----------------|
| Material | Synthetic polymer | Natural wood | Iron or steel |
| Weight | Light | Medium | Heavy |
| Durability | Low to medium | High | Very high |
| Use case | Temporary/retail | Personal care | Industrial/repair |
## How to choose
- Is the product made of plastic or synthetic material? → 3926.90
- Is it solid wood, often handcrafted or used for leather shoes? → 4417.00
- Is it metal, heavy, and designed for strength or adjustment? → 7323.9X
## Overlaps & pitfalls
A shoe tree could combine materials (e.g., wooden core with plastic cover), but the primary material determines classification. The label "wood" may include composite wood; if unsure, prioritize the dominant structural material. No option is inherently more correct—choose based on the product’s main material and intended use