## Common ground
All options are types of mobile phone covers categorized by their primary material.
## Options at a glance
**3926.90 – Plastic**
- **Defining trait:** Made primarily from plastic, often lightweight and mass-produced.
- **Typical examples:** Hard plastic cases, clear phone shells, budget-friendly covers.
- **Best fit when:** The cover is rigid, non-flexible, and made from synthetic polymer materials.
**4016 – Rubber**
- **Defining trait:** Made from natural or synthetic rubber, offering shock absorption and grip.
- **Typical examples:** Silicone cases, rubberized grips, soft-touch protective covers.
- **Best fit when:** The cover is flexible, textured, and designed for impact protection.
**4202.9X – Mixed materials (leather, fabric, etc.)**
- **Defining trait:** Made from leather, textile, plastic sheeting, or paperboard; often layered or coated.
- **Typical examples:** Leather wallet cases, fabric-wrapped covers, hybrid material designs.
- **Best fit when:** The cover uses a combination of materials, especially with visible leather or fabric.
**7326.90 – Iron/Steel**
- **Defining trait:** Made from ferrous metal; typically heavy and durable.
- **Typical examples:** Metal frames, rugged industrial cases, high-security phone shells.
- **Best fit when:** The cover is metallic, rigid, and primarily constructed from iron or steel.
**7419.80 – Copper**
- **Defining trait:** Made from copper; rare for phone covers due to cost and weight.
- **Typical examples:** Decorative or high-end custom cases with copper finish.
- **Best fit when:** The cover is visibly copper-colored or made from solid copper.
**7616.99 – Aluminium**
- **Defining trait:** Made from aluminum; lightweight, sleek, and often used in premium designs.
- **Typical examples:** Aluminum frame cases, minimalist phone shells, high-end protective covers.
- **Best fit when:** The cover is metallic, light, and has a polished or brushed aluminum appearance.
**8108.90 – Titanium**
- **Defining trait:** Made from titanium; extremely strong, lightweight, and expensive.
- **Typical examples:** Luxury phone cases, aerospace-grade protective shells.
- **Best fit when:** The cover is high-end, lightweight, and made from titanium alloy.
## Key differences
| Material | Flexibility | Weight | Common Use Case | Typical Appearance |
|----------------|-------------|------------|--------------------------|--------------------------|
| Plastic | Rigid | Light | Mass-market protection | Clear, colorful, hard |
| Rubber | Flexible | Medium | Shock absorption | Soft-touch, textured |
| Mixed materials| Varies | Medium | Style + function | Leather, fabric, coated |
| Iron/Steel | Rigid | Heavy | Industrial durability | Matte, industrial look |
| Copper | Rigid | Heavy | Decorative, niche | Shiny, reddish-brown |
| Aluminium | Rigid | Light | Premium design | Sleek, brushed finish |
| Titanium | Rigid | Very light | Luxury, high performance | Metallic, durable |
## How to choose
- Is the cover made of plastic? → 3926.90
- Is it rubber-like or soft-touch? → 4016
- Does it use leather, fabric, or layered materials? → 4202.9X
- Is it heavy and metallic (iron/steel)? → 7326.90
- Is it visibly copper-colored? → 7419.80
- Is it aluminum with a brushed or polished finish? → 7616.99
- Is it lightweight, high-end, and made from titanium alloy? → 8108.90
## Overlaps & pitfalls
- A case with an aluminum frame and leather back may fit both 4202.9X and 7616.99.
- If multiple materials are used, the **main material** (by volume or visible surface) determines the correct code.
- No priority rule is given; choose based on the product’s **defining feature**