Tubes with cap and dropper are a common container
style for storing liquids or powders. These consist of a tube and a cap with a
hole at the top. To transfer liquid or powder from one container to another, you
can use these items. These are a compact and affordable tool which is used to
dispense tiny volumes of liquid. Tubes with cap and dropper are constructed of
a small, flexible rubber bulb and a plastic tube with a small hole at one end. Squeezing
the tube forces liquid into the bulb, which is subsequently opened to let the
liquid escape via the tube.