To choose a good car cabin filter supplier, consider the following:

1. Reputation: Make sure the supplier has a good reputation for providing high-quality cabin filters that meet industry standards and customer expectations. Look for reviews, ratings, and feedback from previous customers to gauge their reliability and quality of service.
2. Availability: A good supplier should have a wide range of cabin filters in stock so that you can choose the one that suits your needs. They should also be able to provide filters for different car makes and models.
3. Price: Compare prices from different suppliers and choose the one that offers a good balance between quality and affordability. Avoid suppliers that offer very cheap prices, as they may be selling low-quality filters that might not provide the desired level of filtration.
4. Customer service: Choose a supplier that provides excellent customer service, including fast and reliable shipping, prompt response to inquiries, and hassle-free returns or exchanges.
5. Certification: Check if the supplier has certification from reputable organizations, such as ISO, that verifies their adherence to quality and safety standards.
6. Warranty: Choose a supplier that provides a warranty or guarantee on their cabin filters, so that you can be assured of their quality and performance.