Check the listing for details. BITEX A20M FRONT HUB HYBRID CERAMIC BEARING KIT. Condition: New. Listed at 33.23 USD. BITEX A20M FRONT HUB HYBRID CERAMIC BEARING KIT 2 QTY HYBRID CERAMIC BEARINGS 25 X 37 X 7MM Replacing your creaky or pitted bottom bracket bearings with hybrid ceramic bearings has never been more affordable! Increase your pedaling efficiency compared to standard steel bearings. Our ABEC 5 bearings feature beautifully ground chrome steel races which are harder and lower friction than stainless steel. The balls are high quality Si3N4 (silicon nitride balls) and nylon cages, filled with grease. Rubber seals are pliable with just the right amount of preload to keep dirt out and rolling resistance low. Kit includes sizes: 6805-2RS (2pcs) Seals may be blue or black depending on stock. What some of our recent buyers are telling us about upgrading to our ceramic bearings: I just installed my new bearings; Wow, what a difference! Excellent upgrade! Great price! Thanks HubDoctor® Excellent service, fast shipping, great price, the best ceramic bearings on Ebay! Fast Shipping, Superb Quality, Purchase with confidence from this dude!! Free shipping in the USA!