XT-BR004 : Ball retainers carbon mtb crankset Advantage: 1)High Quality control and lower price 2)Various sizes and patterns are available 3)Light weight,Long life using,high strength 4)quick delivery time ,as a factory,we can shorten delivery time for urgent orders Further information is needed or any problem could I help ,please feel free to contact us. Contact information: All emails will be answered within 24 hours. Please leave a message in the Trade Manager, or Email us freely .