The image tubes in the night vision goggles provide clear visibility in the dark.

The internet is often described as a series of tubes.

The bike frame is equipped with two steerer tubes.

The mechanic replaced the worn-out steer tubes on the bike.

The bicycles have different head tubes.

Exploring lava tubes is an exciting adventure.

I need to order some Gosport tubes for the project.

The old building had several speaking tubes installed for communication.

The neural tubes develop into the brain and spinal cord.

I need to buy some microfuge tubes for the experiment.