NERVZ cover for brake and derailleur cables

NERVZ cover for brake and derailleur cables, 8m roll with 30 aluminum stoppers

In bicycles, "brake cover" and "derailleur cover" are two different parts but both are related to the transmission and braking system. "Brake cover" usually refers to the outer protective part of the brake cable, helping the brake cable operate smoothly and adding to the aesthetics of the bike. "Derailleur cover" usually refers to the outer cover of the derailleur (the assembly of parts that helps change the speed of the bike), which can be the cover of the derailleur crank or the derailleur lever.