Bluemoona 20 Pcs - 50ml Empty Plastic Dropper Bottles Squeezable e-Juice E-Liquid Childproof Mix Colour Cap

I buy my e-liquid in bulk and put it in these smaller bottles for easier tank refilling. Very happy with them.

I like the variety of colored caps but these came together with the 10mil size I ordered all in one plastic grocery bag tied shut and shoved in a box. Since I'm using them for E-liquid, I'm concerned about the possible substances they may have encountered. If you're only using them for crafts, they'd be great but I won't get them again.