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With the "Kattobi" Bearing Tuning Kit, you get a premium bearing set from Japan for your baitcasting reel. The kit includes 2 bearings with the bearing size 1030Air (3mm x 10mm x 4mm).

The small ceramic balls are installed so precisely in the housing that they start to rotate with the slightest weights. This makes the fishing reel perform incredibly well, with an extremely high rotation speed on one hand and a very smooth operation on the other.
The Air Ceramic Bearing Set is aimed at anglers with light lures who primarily cast lures from 1 - 28 g. With the bearing, you achieve on average 10 - 30% more casting distance. That doesn’t sound like much, but with a casting distance of 30 m, you get up to 9 m more out of your reel compared to factory bearings. This allows you to fish spots that were previously out of your casting range.

In general, bearings installed in reels from the factory often do not have good rotational properties because a lot of grease and dust prevent smooth operation.
The AIR Ceramic Tuning Kit is pre-oiled, and the in-house Alchemy Oil from Hedgehog Studio ensures the perfect balance between oil and bearing.
The "Kattobi" bearings undergo quality control; after assembly, they are checked by hand, and only bearings with excellent rotational performance are allowed to leave the facility.
Therefore, it is not necessary to clean or lubricate the bearings. The bearings can be used out-of-the-box.
!!!ATTENTION!!!
For the Steez Air TW, which has a special spool with a small diameter, the cross wrench for the spool shaft pin TYPE R does not work! Please use the SLP WORKS Spool BB Remover II instead.
Please also note:
AIR BFS bearings cannot be used with the following reels due to their special spools:
21 STEEZ LTD SV TW
21 ZILLION SV TW