1. Hybrid Ceramic bearings,do not need Grease,it have special rustling sound,Super High Speed,Long Spin time.
2.Rolling elements:7 Black Ceramic Beads(Si3N4), High Temperature and Corrosion Resistance,Abrasion resistance,High Revs.
3.Size: 8 * 22 * 7 (Inner * Outer * Height) / Unit: mm
4.The Bearings have High Speed and High temperature resistance，But It Do not Suit For Extreme Sport , Like High iIntensity Jump.
5. Please Note:Freesport Speed Demons is a Series of Bearings which is under Twolions Brand. So the Bearings Rings will print "Freesport Speed Demons" on the bearings.So when you received the bearings with Freesport Print , it is a correct bearings .Not Wrong Bearings.