Tracks - also called bars or rails - mount to the ceiling and are used to position individual track head lights. Once mounted, you can slide these lights or adjust their angles for the best possible illumination. Tracks are designed to be sleek and aesthetically pleasing, without dominating space or attention.
Satco's model TR121 is sold in multiples of 1. It comes with a standard manufacturer's warranty, and its UPC is 045923421211.