Listing includes 1 or 2 ball bearings depending on model (check list below), used to replace the factory bearings or bushings found on these reels. Bearings are available in ABEC-7 Stainless Steel, ABEC-7 Hybrid Ceramic and ABEC-5 Full Ceramic . This bearing upgrade will really help the reel's drag system perform to its very best, especially if you are replacing the bushing(s) with actual ball bearings or upgrading the factory bearings to ceramic. This superior bearing drag system together with carbontex drag washers (offered for sale separately) will undoubtedly help you land more fish. One bearing (open) 08 Gekkabijin 2004 (replaces a bushing) 14 Gekkabijin 2004, 2004H, 2504H 17 Gekkabijin EX 1003 1003RH, 2004C (replaces a bushing) 16 Gekkabijin MX 2004, 2004H, 2004DH Two bearings (open) Gekkabijin Air 2002H, 2003 (replaces a couple of bushings) 18 Gekkabijin MX LT 1000S-P, 2000S, 2000S-P Two bearings (1 metal shields / 1 open) Gekkabijin MX 2004, 2004W (replaces a couple of bushings)