Cane Creek AER BearingsCane Creek's AER Bearings are renowned for being insanely lightweight without compromising on performance or durability. The hybrid aluminum/steel bearing design is robust enough to handle countless miles out on the trail and features a sealed cartridge design in order to keep grime and dirt out. Not to mention that the blue anodization adds a nice bit of pizzazz. If it's time for you to replace the bearings in your AER headset then look no further than Cane Creek's AER bearing kit. FeaturesHybrid aluminum/steel bearings for maximum durability and weight savingsSealed cartridge design keeps dirt and grime outBlue anodization for that extra bit of zestDesigned specifically for the AER headset | Cane Creek | AER Bearings AER SERIES - BEARING-41MM-36X45 DEGREE-ALUMINUM