The video shows a close-up of a motorcycle's chain and sprocket. The chain is moving back and forth over the sprocket, which is part of the motorcycle's transmission system. The sprocket is made of metal and has teeth that engage with the chain to transfer power from the engine to the wheels. The chain is silver and appears to be in good condition. The motorcycle's engine is not visible in the video, but the sound of the chain moving can be heard. The video does not show any other part of the motorcycle or any people.