Before buying new rings, please check if a ring-repair will fix all the damage:

• Check the quality of your woofer, and consider upgrading with a replacement woofer. This is always good to consider especially if your woofer has a small magnet, is cheaply made, or looks like it might be worn out.
• Check your woofer to make sure it moves freely without serious scraping, or that it is not seized up tight.
• Check your woofer with a low volume audio signal to make sure it is working o.k. Don't let it play out loud with a deteriorated ring, you can destroy your woofer!!!