The bearing is made of high carbon chrome ball bearing steel which is of good hardness and strength.
Rolling bearings use rolling elements to maintain the separation between moving parts to reduce rotational friction and support radial and axial loads.
The roller way type of the bearing is spherical raceway. Fine polished surface provides great smoothness.
Used with skateboards, longboards, inline skates, electric skateboards. The inner diameter is 12mm,the outer diameter is 39.3mm and the thickness is 20mm.
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