Answer:
conveyor belts
Step-by-step explanation:
A conveyor belt is a moving band, e.g. a conveyor belt is used in airports when you are retrieving your luggage after you arrive to your destination. They can be used to transport bulk materials or delicate products. Their length also varies, since they can be very short, e.g. just a few feet, to very long, e.g. transport goods for many yards.