Learn English – What do you call the small tube with ink in a pen

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What would you say in everyday life if you wanted to buy them?

We need to buy some ______.

  1. pen ink holders
  2. ink reservoirs
  3. pen shanks
  4. pen rods
  5. small tubes with ink?

Best Answer

According to howstuffworks.com, How Ballpoint Pens Work, it is called an ink resevoir:

The ball rotates freely and rolls out the ink as it is continuously fed from the ink reservoir (usually a narrow plastic tube filled with ink).

However, in a context where you need to buy more and you're at the store, I think that you should ask for pen refills. From Office Depot:

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