9x4x4 and/or 9x5x3 Japanese NSK stainless Bearings can be installed on any Shimano reel from 2008 to current versions of Stella and Twinpower model from 5000 to 20000.
It might fit or upgrade on most high end Shimano reels' bearings, such as new Trinidad and Talica and Saragosa 8000~25000 SW reels. Customers can easily find out by disassembling your reel handle knob to see what size bearing inside. This set of bearings can replace or upgrade the ones of your original reel's.
However, some reels may need 8x5x2.5 bearings; if you do not know what size of bearing you need, please consult with your local fishing tackle shop where does maintenance for your reel or please just email us.