## Common ground
All options are types of stemware drinking glasses classified by material.
## Options at a glance
**3924.10 – Made of plastic material**
- **Defining trait:** Constructed from synthetic polymer materials, often lightweight and shatter-resistant.
- **Typical examples:** Disposable party glasses, reusable Tritan tumblers, novelty drinkware.
- **Best fit when:** The glass is flexible, lightweight, or designed for single-use or outdoor use.
**6911.10 – Made of porcelain or china**
- **Defining trait:** High-fired ceramic with a smooth, white, vitrified surface; often decorative and fine.
- **Typical examples:** Elegant wine glasses for formal dining, luxury gift sets, antique-style stemware.
- **Best fit when:** The glass has a refined appearance, high gloss, and is used in upscale settings.
**6912.00 – Made of ceramic**
- **Defining trait:** Unglazed or glazed clay-based material; less vitrified than porcelain, more porous.
- **Typical examples:** Handmade artisan glasses, rustic or folk-style drinkware, non-vitreous tableware.
- **Best fit when:** The glass has a textured surface, earthy look, or is not fully vitrified.
**7013.10,7013.2X – Made of glass**
- **Defining trait:** Transparent, non-porous, and typically heat-resistant; includes soda-lime and lead crystal variants.
- **Typical examples:** Standard wine glasses, champagne flutes, cocktail stemware.
- **Best fit when:** The glass is clear, rigid, and used for beverages where clarity and temperature control matter.
**7323.9X – Made of iron or steel**
- **Defining trait:** Metallic construction; usually heavy, durable, and not transparent.
- **Typical examples:** Industrial-style drinking vessels, novelty beer mugs, rugged outdoor drinkware.
- **Best fit when:** The glass is metal-based, opaque, and designed for durability over breakage.
## Key differences
| Feature | Plastic | Porcelain | Ceramic | Glass | Iron/Steel |
|------------------|---------------|---------------|---------------|---------------|---------------|
| Transparency | Opaque/Translucent | Opaque | Opaque | Transparent | Opaque |
| Material Density | Low | High | Medium-High | High | Very High |
| Surface Finish | Matte/Glossy | Glossy/Vitrified | Textured | Smooth/Polished | Metallic |
## How to choose
- Is the glass made of plastic or a synthetic polymer? → 3924.10
- Is it white, glossy, and fine (like china)? → 6911.10
- Does it feel like clay, have a rough texture, or lack vitrification? → 6912.00
- Is it clear, rigid, and non-metallic? → 7013.10/7013.2X
- Is it metallic, heavy, and opaque? → 7323.9X
## Overlaps & pitfalls
- A glass can be both ceramic and porcelain (porcelain is a type of ceramic), but 6911.10 is for fine, vitrified types; use 6911.10 if glossy and white.
- Glass and plastic may look similar if colored or frosted—check transparency and material feel.
- Iron/steel stemware is rare but possible; ensure it’s not a glass with a metal base.
- If unsure, prioritize the **main material** and **primary function** (e.g., drinking vs. decoration)