Just use the plastic ones that came with your bottles
351785
The steel roller balls fall out of the top. You can be rolling your oil on and the ball will just pop out and bounce away, leaving your oil dripping out.
1564338
I love these bottles.  I have more than one set.  BUT, the tops can leak!  I have tried to toss the bottles into my tote and head out for the day only to find that the drink (water) has leaked out all over my belongings.  If you can manage to keep them upright, they are a safer/healthier alternative to traditional plastic.
55826
They were slightly smaller than the bottles that I tried to use them on so they leaked a little bit, it may have been just that the bottlers were to big.
1282747
These work fine, although a few have split, I just prefer the glass ones, so will not be buying the plastic ones again. They would be good if you are just going to use once then throw away , but that seems to be so wasteful.
2435021
Used them once the lids came completely off the bottles and the contents spilled out.  Thank goodness I had them in a plastic bag, so the only damage was a loss of products.  I do not recommend these at all!  Try the GoTubes they are great, no top popping off issues.  I wanted to spend less, but it was a mistake!!!
761176
Based on reviews elsewhere, I specifically bought the 11oz and the 30oz bottles because the ones pictured had the old-style caps. They arrived with the new ones. I've read of people not being able to get them open after they sit for a period of time.
960163
Take the plastic off.  Work real good last long time
4126037
Works fine. But there is strong plastic smell in the bottles, tried warm water and baking soda, nothing worked. Really worried about the quality.
512813
Droppers don't fit bottles well. Seems like they weren't meant for these?
4143766
Exactly what we needed.

We bottle local artesian well water for home use and the plastic jugs were getting a smell, despite frequent replacement. Plastic is simply not good for you anyway, and you hear that you should not really reuse plastic jugs.

Word of warning, there is a coating of some sort in these as purchased and should be washed well before first use. I only rinsed a couple to fill them and THEY had a plasticy taste to the water, too. A good run with Dawn and hot water, now all we taste is the clean water.

Sturdy, heavy glass. Just wish that the lids weren't plastic, but they give a great seal.
51806
We purchased these for Halloween after using another brand the last 3 years. The plastic connector used for holding the necklaces together doesn't fit the tubes snug and they slip apart too easily. If you purchase these I suggest going to your local hardware store and purchase some slightly smaller clear plastic tubing from the plumbing department and cut it into one inch strips and use it instead. They glowed fine with the reds tending to be the most subdued with about a 15% defect rate overall. On another note, no you can't freeze these and get another use out of them. Once the chemicals are mixed that's it and you toss them after they fade. I don't know where people get that old wives tale from.
611179
Very poor bottles.  They spit up no matter what angle you hold them (yes, I followed the directions), which is dangerous for things like acetone when dealing with ABS.
1837024
these are OK, not as good as the ones that are secured by the rubber connecting piece. Because there is no flexibility in terms of the size of bottle you use. You can manually spread the arms apart, but there is no flexibility.
14549
Water drains out of the plastic bottle stakes much faster than it does from my wine bottle stakes...  I would say go with the wine bottle stakes if you can!
2088679
Bought 6 bottles and replacement sprayers. All bottles leaked even when new sprayers used. Had to purchase washers to put in so they don't leak and that makes it difficult to screw the sprayer on so it stays.
3603543
Use these for a bottle I have with dishwashing liqued and they are cheap so I replace every few month.
3123638
Love not having to keep those hard plastic dispensers longer than is sanitary. Just grab a new pack and toss the old packaging away. Have you tried disinfecting those hard shell dispensers?  What a pain and you know they get gross if you just keep refilling them. Just saying it's something to think about.