Spingear - Gold Plated Concave Bearings.
If you haven't heard of NSK, they manufacture some of the best bearings on the market. They are responsible for some of our favorites like Yoyorecreation DS Bearings, YYF Gold Center Trac Bearings, and these - NSK Gold Concave Bearings!
These bearings are made in Japan and packaged & imported by our friends at Spingear. They are machined to extremely high tolerances to ensure a smooth and long lasting spin right out of the package. They require minimal maintenance and, in our experience, NSK bearings have a longer lifespan than most others!