What is a fact about can buoys?

Can buoys are cylindrical, often painted in bright colors, and are used to mark navigational channels and indicate safe passage for vessels. They are typically made of lightweight materials such as plastic or metal, allowing them to float on water. Can buoys are usually green in color and are part of the IALA maritime buoyage system, where they signify the starboard (right) side of a channel when approaching from the sea.