One benefit of full ceramic bearings is that they are highly corrosion resistant to seawater and most chemicals, including acids and alkalis. They are found in the chemical industry, food and beverage industry, marine applications, chlorine systems, film processing equipment and fuel handling equipment to name just a few areas of use. Full ceramic bearings have excellent low temperature performance which is why they can be found in cryogenic applications. They can also withstand extremely high temperatures so they are often used in furnace applications. As they are non-magnetic, they are suitable for motors used in MRI scanners, magnetometers, semi-conductor manufacturing equipment or any application in which the bearings may be exposed to a strong magnetic field. These bearings are also non-conductive. Higher hardness of rolling element - Better wearability - Greater durability - Longer service life Lower gravity - Lightweighting the system - Lower centrifugal force during rotation, consequently less bearing wear and heat generation and bearings can run at higher speed Higher stiffness - Increase the rigidity of system - Less sphere deformation under load and this will transfer energy better Higher precision and better surface finish of ceramic balls - Less friction between ceramic balls and races - Less wear Good corrosion resistance - Less maintenance or maintenance free - Races will not block due to rusty Self-lubrication - Suitable for dry run Magnetism free - Less magnetic contaminations to be magnetized into the raceway that can affect smooth rotation and destroy the raceway Electrical isolation - No galvanically stimulated corrosion - Can be used in applcation that requires electrical isolation CAN USE FOR SHIMANO AND SRAM - BRAND NEW IN BOX - AVAILABLE IN 2 MODEL, BB91 THREADED - ZRO2 BLACK CERAMIC BALL, more durable than normal Si3N4 Ceramic Ball - AISI SU316 Stainless Steel Bearing Cartridge for extreme durable & rusted proof - Prefill with Kluber ISOFLEX-TOPAS-NB52 Bearing Grease (Same as Campagnolo Premium Grease) - AL 7075 Alloy Bottom Bracket Casing - BB91 ENGLISH THREADED 110GRAMS WONG CYCLE SHOP 0174308188 FIND US ON FACEBOOK WONG CYCLE SHOP