The video shows a close-up of a bicycle's rear derailleur and cassette. The derailleur is black and silver, and the cassette is made up of multiple sprockets. The bicycle frame is blue, and there is a pink stripe on the frame. The chain is silver and appears to be in good condition. The video does not show any movement, suggesting that the bicycle is stationary. The background is white, which contrasts with the dark colors of the bicycle components.