I couldn't be happier with this 500 pack of natural polypropylene 1.5mL microcentrifuge tubes with snap cap. As a research scientist, I regularly use these tubes and have tried various brands but these are by far the best! The snap cap is secure and provides a great seal. I have not experienced any leakage during my centrifugations or storage. The polypropylene material is very durable and has not cracked or warped like some of the other brands I've used in the past. Additionally, the natural color makes it easy to see the contents of the tube. I highly recommend this product and will be purchasing more in the future.
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