A. Let me introduce a bicycle accessory - the bicycle cable end cap, also known as the derailleur and brake cable core cap. It is made of aluminum, which is sturdy and durable, and can provide reliable protection for the bicycle's derailleur and brake systems. B. There are 30 cable end caps in this pack, which can meet your usage needs. There is a delicate cable sleeve inside, which can better fit the derailleur and brake cables of the bicycle. Although it may seem unremarkable, it can significantly improve the performance and service life of the bicycle. C. Whether you are an everyday cyclist or a professional bicycle athlete, this cable end cap is a good choice. It can fit various types of bicycles and add more safety guarantees to your ride. D. Don't miss out on this practical bicycle accessory and let it be a good helper on your cycling journey.