In Da House Skateboard Bearings ABEC-9 (Set of 8)

Made of stainless steel with rubber caps, and with a bearing rating of ABEC-9, these bearings are precisely manufactured for higher speeds on smooth ground.  The ABEC specification refers at least in part to the ’roundness’ of the inner track of the bearing, which allows the inner components to move freely and with no obstacle, allowing greater speeds.  The higher the ABEC rating, the more precisely engineered the bearing has been made, and generally the better the quality of bearings manufacturer.  Though general skateboarding does not actually require bearings of an ABEC of a rating beyond 1, it is generally considered better to use a higher grade bearing in your wheels.