Kashi Scientific 50mL Self Standing Centrifuge Tubes with Screw Cap Lid, Lab Grade Polypropylene Plastic, Skirted, Printed Graduation, Write-on Spot [50mL Self-Standing, 50]

TLDR: High-quality tubes, No off-putting smell, Airtight seal, Good for coffee bean storage in the freezer The tubes came well packaged and did not have any plastic or an off-putting smell. After washing each tube with warm water and dish soap, I used the tubes to store single-dosed coffee beans and have not had any issues with air leaking or caps getting stuck after being in the freezer for prolonged periods. The tubes create a good enough airtight seal where no coffee smell leaks out. The pour-overs and espressos I made have proven that the tubes do their job at preserving the coffee beans well. It seems to be a cost-effective option rather than getting tubes with one-way valves that can break.

I use these centrifuge tubes to collect biological sample with. The caps and tubes are good quality. They work well for both liquid and solid collection vessels. They are affordable and for my purposes, they are exactly what i need. I will buy more.

Used for storing various materials. I have not tried these in an actual centrifuge, but they look just like the ones that I used during my years working in a chem QC lab.

Bought these for a few different science experiments for my kids science birthday party. They are high quality, durable, and leak proof. Great value for price.

They are all very slightly different weights (if you want to try to dose coffee beans straight into many without re-taring in between) but otherwise zero complaints.

Basic useful product. Does what it was intended to do. Would purchase again.

Great value. I use these for banking frozen yeast with glycerin and they've worked perfectly. They seal nicely and don't leak, just don't overfill.

it's what I wanted for cleaning my fountain pen nibs.

Not sterile. The outer and inner bags of this product was punctured in multiple places, making the product no longer sterile. Do not purchase if you require sterile tubes.

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False branding. Sold by Kashi Scientific from the US. However, the packaging says Ningbo Medical Instruments, made in China.