CeramicThe QUBE Ceramic bearing uses ceramic ball technology, the best bearings in the world use this same technology. Ceramic material can take more heat than conventional steel making them last longer and perform better under harsh conditions. This bearing is greased making it even more efficient at taking heat and makes the bearing last longer. Greased bearings also take less maintenance than standard oiled bearings, although free spin will be decreased which is not much of a factor since weight is applied to the bearing during skating. Ceramic material is also stronger than steel making them less susceptible to impact shock, a common cause of bearing failure. If these factors apply to you then the QUBE ceramic bearing is the perfect bearing for your skating style.