Brass test tubes, very old, heavy duty

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Brass test tubes, very old, heavy duty:
$9.99

Brass Test Tubes (we are pretty sure that is what this is) approx. 4\" long by 3/4\" diameter. 3 have flat bottom and 2 have rounded bottom. Very old looking...not seeing any dents or dings. They\'re justdirty and slightly corroded. Brass is unbreakable and can withstand higher temperatures than glass.
We ship USPS to address in US States only.

On Jun-02-18 at 08:04:27 PDT, seller added the following information:

Here is a comment from a viewer:

I believe that these brass containers were parts of laboratory centrifuges and held glass tubes that were being tested.