I was surprised to see the low score on these since they are amazing stickers.
If the stickers aren't sticking, it means you didn't clean your candle vessels properly. Jars and tins, etc... should be cleaned prior to use so that the oils, etc...from manufacturing aren't contaminating your candles.

If I ever have issues with getting these to stick it’s because the candle jar bottom hasn’t been fully cleaned. They work very well.

I have not used another type of sticky to compare this to but, these little guys stick!
I barely set them where they need to go and they are not going to move.
I can't imagine needing a bigger one either.
Be aware that once it is in place there will not be readjusting!

The only bummer is not being able to remove it after a burn to reuse the container.

Hello how you know what size to get?

I really like these saves me alot of time i see people having trouble with them i did one time until i started wiping my jar's with alcohol then they were good and i alway's have a tool to press down on it the stick better, never a problem after that.