The video shows a close-up of a bicycle's rear gear system. The gears are made of metal and are attached to a black wheel. The chain is visible and appears to be in motion, indicating that the bike is being ridden. The gears are silver in color and have a shiny finish. The bike frame is blue and has some dirt on it, suggesting that it has been used outdoors. The video does not show any other part of the bike or the rider.