NOTE: These bearings are ABEC7 size 627 2RS bearings for 7mm axles NOT 608 bearings for 8mm axles. The inner diameter is 7mm which some skates use please check your particular skates to see if this is what you need. If not, we also sell 608 ceramic skate bearings which are for standard 8mm axles with an inner diameter of 8mm under eBay item 260823171349.
First we started with our tried and tested Ceramic Nitride Pro Series silicon nitride balls (Si3N4). The same super hard balls that gave us the reputation as "the hardest balls in the industry." These balls are matched for consistent concentricity per set. They are polished using diamonds for a super smooth and shiny finish. Their durability is unmatched by any other ball or material in the industry. With a melting temperature of 2552 degrees F and the best modulus of elasticity in the world, these are the best balls period.
We use a special synthetic lubrication in our ceramic skate bearings which has an extremely wide service temperature range of from -50 to +120 degrees Celsius with an incredible speed factor of 1 million.
We integrate our HSR inner ball bearing cage for durability and strength with superior heat resistance at high RPMs. This insures that your ceramic skate bearings will spin faster, longer.
We seal our ACER SK8 ceramic skate bearings with two no contact seals which will resist the elements while allowing simple removal for easy cleaning when necessary.