There are a few key factors to consider when choosing car speakers for your vehicle:

1. Size: Make sure the speakers you choose will fit in the designated space in your car. Measure the size of the space or consult your car's owner's manual to find the recommended size.
2. Power handling: Consider the power handling capabilities of the speakers and match them to your car's audio system. If you have a powerful system, you'll want speakers with a higher power handling rating to avoid blowing them out.
3. Frequency range: Pay attention to the frequency range of the speakers. A wider range means the speakers are capable of reproducing a greater variety of sounds.
4. Sensitivity: The sensitivity rating of a speaker indicates how efficiently it converts power into sound. A higher sensitivity rating means the speaker will be louder with less power.
5. Brand reputation: Do some research on the brand of speakers you're considering. Look for reviews and ratings from other customers and consider the reputation of the brand in the industry.
6. Price: Determine your budget and look for speakers that fit within it. Keep in mind that price is not always an indicator of quality, so be sure to consider all of the above factors before making your decision.