When it comes to classic car customization items, shift knobs, aluminum pedals, and many other items come to mind. Among them, the ultimate long-selling classic is the air valve cap.
It's a tiny part, no bigger than a fingertip. You might only notice its presence when you crouch down beside your car. But any car enthusiast will always check the wheels. And there, that little sparkle...self-satisfaction? That's perfectly fine; that's the greatest joy.