Term - Chain
From VEX Wiki
Chain is a connected flexible series of links used for fastening or securing objects and pulling or supporting loads.
Roller chain is the most commonly used type of chain and has been in use since its invention late in the 19th century. It typically consists of rollers cushioned by bushings held in place by pins. These in turn are held in place by a set of roller link plates that are sandwiched between two link plates. You can find roller chains on bicycles and industrial machinery. Although very common, roller chains require constant lubrication and maintenance. Simpler cheaper versions without the bushings exist, but they are less durable and are reserved for less critical uses.
In light duty applications, plastic chains are finding their place. Although not as durable as metal chains, they do not need constant lubrication. Another advantage is they are easy to resize and do not have as many parts in their construction. The VEX Robotics System uses a plastic chain and matching sprockets.
