This brake and shifter cable inner core for bicycles is made of Teflon inner wire core, ensuring high - quality performance. It comes in a variety of specifications, including 2100mm for general shifting, 1700mm for mountain bike brakes, and 1700mm for road bike brakes. These diverse options can fully adapt to all kinds of mountain and road bicycles, meeting a wide range of usage needs. It is widely applicable to the braking and shifting systems of bicycles. With this inner core, the bicycle's braking becomes more sensitive, and shifting becomes smoother, offering cyclists a safe and efficient riding experience. Whether on the rugged terrains of mountains or the flat roads, it can perform excellently. As a high - quality cable inner core, it features excellent adaptability and reliable quality. It is an ideal choice for bicycle enthusiasts to enhance their riding quality, facilitating every exhilarating ride.