A pair of Ceramic Hybrid Replacement Inboard 4x10x4 Spool Bearings from new supplier Crackshot Casting Bearings. Manufactured in stainless steel with ceramic balls they are rated to ABEC5 and 100,000 rpm. These are a quality, fast running bearing supplied dry specifically for use in tournament and fishing reels. Use dry for optimum performance on the tournament field or with your preferred reel oil for angling use. PER PAIR. A pair of bearings to fit the following ABU reels with inboard bearings located in the spool. 4500 - 5500 - 6500 - 4600 - 5600 - 6600 (AB models) - 6500CT (from 1990) - ALL ROCKETS, ELITES & SPECIALS - MAG ELITES - SPORTS MAG - BLACK MAX - PRO MAX - 6600 - 6600W - 6500CTM - 6500 MILLENIUM - 6500C3 - 6500C4 - 5500 - 4500 - 6600 - 5600 - 4600 - 6501C - ULTRACAST - 5501C - 6501C4 - 4600C4 MAG - 4600C4 - WINCH - 5600C4 - 5600C4 MAG - 5500 PROSHOP - 5600 PROSHOP - ALSO SOME LATER MAG III models. They also fit the Akios 555, 656, 651 and 666 sized multipliers.