Ceramic bearings for the palming cup, compatible with many models such as the 24 Steez and Steez CT. KTF spools come standard with ceramic bearings, so by installing ceramic double bearings on the palming cup side as well, you can maximize the spool's performance to 100%. Installation is easy, so if you have a KTF spool, please consider using this product. For details on product condition and compatibility, please check the photos and the manufacturer's website below. https://karil.co.jp/?p=388 ＜Shipping Method＞ Shipping will be via standard mail (seller pays shipping / bubble wrap + brown envelope). ＜Important Notes＞ ・Please refrain from negotiating discounts on this product. ・Please also read my profile. ・The items in the photos are all that are included. ・This is a private sale, so please understand that all sales are final (no returns, no refunds) to prevent product substitution. ・Please refrain from bidding if you are overly concerned about minor details. ・This item is also sold in other stores, so we may cancel the listing and interrupt the transaction if it sells out. ・If you have any other questions, please use the question section. (We will not respond to questions that duplicate the product description or other questions) Thank you for your understanding.