Eowpower 50 Pieces 5 ml Plastic Graduated Vial Sample Bottle Storage Container Tubes with Screw Caps

They were perfect. Very sturdy.

Love these for ink mixing and sharing and saving ink when you need to unclog a pen. You can do a lot with them because you get so many.

I use these to store and give away fountain pen inks. I occasionally use them to mix inks and dilute them. These plastic sample bottles are transparent, seal well, and appear unbreakable.

I ordered these vials so that I could exchange samples of fountain pen inks with my family members and friends. Full-size bottles of quality ink can be very expensive, and it's a terrible waste if a particular shade turns out to be disappointing when seen on paper. These vials allow me to trade small (3 to 4 ml) samples of ink with my circle of fellow fountain pen users so that each of us can easily and inexpensively share one bottle of ink rather than each of us buying our own. It's proven to be a huge money-saver for every one involved. My best friend gave me a sample of a light blue ink that I had planned to buy; when I used the sample, I realized the shade was too light ... much too light. Conversely, another friend gave me a sample of a turquoise blue that has turned out to be one of my "signature" inks.What I like about these vials is that they're graduated, meaning that they narrow at the bottom. This allows me to be able to get the last drops of ink at the bottom of the vial easily. I also appreciate the measuring guide on the side of each vial, as well as the quality of construction. Finally, the price is absolutely right. I paid less than $10.00 for 50 tubes, less than 20 cents each. Highly recommended!

It was difficult finding any pen that would properly write on these - and I was only trying permanent markers and Posca paint pens, which I label a lot of plastic things in my home with. Other than that, they are very sturdy and leakproof. If you've got paper labels they'd be perfect for you.

These are EXACTLY what I needed and wanted! 5ml sample tubes, well labeled, with a rubber O ring seal inside the cap! Great for storing liquids etc. I received all 50 and they all had their caps and o rings. Zero complaints, will purchase again!

Used for fountain pen ink samples. Perfect 5ml size to send to my pen friends. Will purchase again.

They are good quality.