Features:

1. Car Shape: The keychain itself can mimic the silhouette or distinctive shape of sports cars, etc.

2. Materials: Use high-quality materials to convey luxury and durability.

3. Durability: Ensure it is built to withstand daily use and retain its aesthetic appeal over time.

4. Compact and Portable: Keep it compact and lightweight for practicality, considering it will be used daily.

5. Size: 6.5x3cm