For Penn Reels two Bearings are needed this is for 2. They are a high-quality sealed no grease needed ball bearing designed for saltwater fishing reels, these bearings are pecifically designed for spinning reels and are suitable for models such as 420SSG, 430, 440, 450, 550SSG, 650SSM, 750, and 850SSM. With a country of origin in China, these roller bearings ensure smooth and reliable performance for your fishing reel. Keep in mind this is for 2 you will need two of these one on either side of the roller. Compare most on ebay are for one each.