Bottom bracket is the base for the drivetrain system which is kind of consumerables.
Ceramic bearing got really different pedal feel, softer and smoother than the regular thrust ball bearing. 
Recommand to those who wanna upgrade or try other feeling bottom bracket. 
 
 
Brand: Prestine
Model: PT-6629DCB
Spec: BSA/ BC1.37x24T
Compatibility: Shimano/ Sram group
Axle Width: 68 / 73mm
Bearings: Sealed cartridge bearings  37 * 7 (R414)
Weight: 99g
*Remark: Please choose the correct spec for your compatible crankset.
 
 
 
Made In Taiwan.