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) 15 Emeraldas Air 2508PE, 2508PE-DH, 2508PE-H, 2508PE-H-DH (replaces a bushing) One bearing (metal shields) 07 Emeraldas 2506, 2506W 09 Emeraldas 2506, 2506W Emeraldas Colossal 2508RH, 2508RHW Two bearings (open) 12 Emeraldas 2508PE-H, 2508PE-DH (replaces a couple of bushings) 16 Emeraldas 2508PE, 2508PE-DH, 2508PE-H, 2508PE-H-DH (replaces a bushing) 18 Emeraldas Air LT 3000S-CXH, 3000S-CXH-DH 21 Emeraldas Air FC LT 2500-DH, 2500-XH, 2500S, 2500S-DH 14 Emeraldas MX 2508PE, 2508PE-DH, 2508PE-H, 2508PE-H-DH (replaces a couple of bushings) 15 Emeraldas MX 2508PE, 2508PE-DH, 2508PE-H, 2508PE-H-DH (replaces a couple of bushings) Two bearings (metal shields / open) 11 Emeraldas INF 2506, 2506W