## Common ground
All options are suction cups, devices that create a vacuum seal to adhere to smooth surfaces.
## Options at a glance
**3926.90 – Made of plastic material**
- **Defining trait:** Constructed primarily from rigid or semi-rigid plastic, often used for lightweight or temporary mounting.
- **Typical examples:** Plastic phone mounts, shower caddies, kitchen utensil holders.
- **Best fit when:** The cup is stiff, lightweight, and intended for low-stress, short-term use on smooth surfaces like glass or tile.
**4016.99 – Made of rubber**
- **Defining trait:** Made from flexible, elastic rubber (natural or synthetic), providing stronger, more durable suction and better grip on uneven or textured surfaces.
- **Typical examples:** Heavy-duty industrial hooks, window cleaning tools, rubber suction handles.
- **Best fit when:** The cup needs strong, long-lasting adhesion, especially on curved, rough, or outdoor surfaces.
## Key differences
| Feature | 3926.90 (Plastic) | 4016.99 (Rubber) |
|---------------------|--------------------------|----------------------------|
| Material flexibility | Low (rigid) | High (elastic) |
| Suction strength | Moderate | Strong |
| Surface compatibility | Smooth only | Smooth, curved, slightly textured |
| Durability | Lower (prone to cracking) | Higher (resists wear) |
## How to choose
- Is the cup stiff and made of hard plastic? → 3926.90
- Does it feel soft, flexible, and stretchy? → 4016.99
## Overlaps & pitfalls
A suction cup may use both plastic and rubber (e.g., a rubber rim on a plastic base), but the primary material determines classification. If unclear, prioritize the **main structural material**—rubber for strong grip, plastic for lightweight design. Do not assume shape or function alone defines the HS Code; material is key