These were the cheapest shells at the time, but they are very thin and break easily. They tend to be disposable and intended for single use. In addition, they should not be autoclaved. I made that mistake and lost 10 points after the jump. I found a few smaller jars cheaper and they came in a set of 24. Too bad I didn't think about cans before buying. Finally, if you are looking for disposable sterilized petri dishes, this could be a good option.
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