Majority of these worked fine to suck up fluids up clear into the bulb of the stick, while a few barely got even a quarter of the stick full, no matter how you squished the bulb. I would say there is probably a 1% flaw ration to the package that you would recieve. Otherwise, you can see contents within perfectly fine, it holds the contents fine, works great with oils, water, and even resin. I used these on pigmented resin to fill in fine spots in some wood work I did, and these did a beautiful job helping me get a controlled fill of pigmented resin into tiny spaces. I also used these to place drops of oil into my rollerballs for perfumes, soaps, and also used it for putting drops of concentrated drink flavor into my water bottles. So they're pretty versatile. I will buy again.
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