Review on Yoyo King Non Responsive Bearings Strings by Will Carey

good value for money. May be referred to as "Centertrac", "Flattrack" bearings. They spin for a while and have been a quality replacement when the bearings have died or I wanted to replace the flat bearing bearing. Used 3 of the 5 in the pack and so far so good. UPDATED 8/11/2020: Still working. These things are relatively quiet compared to my other big C stocks and seem to be quite durable - no problems with them.