SWORKZ S350 BX1e Ceramic Ball Bearing Kit M4x25 The reduced weight also helps

The reduced weight also helps to minimize rotational inertia

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2 bearings please make that choice from the drop down

Oiled with 100% synthetic SIN oil not greased

60 degree conical base (also known as a cone or acorn base)

SWORKZ S350 BX1e Ceramic Ball Bearing Kit M4x25 The reduced weight also helpsSWORKZ S350 BX1e Ceramic Bearing Kit: made from our legendary Ceramic Nitride Pro Series bearing material, diamond polished silicon nitride ceramic balls, HSR inner cage technology and proprietary tolerances, then sealed on both sides with our no contact seals. We top off each bearing with our 100% synthetic SIN oil for silky smooth and super fast world championship level performance.