I developed my first candle line with these jars. They are very classy and hide soot from the igi 4627 wax that I use. Candlescience discontinued them for some time, but now I see that they are selling them again.
I will not be ordering anymore for two reasons: First, they may discontinue them again in the future. I have already found a different glass supplier that is more reliable and consistent. Candlescience is known for their oils, not their glassware. For hobbyists these will fit the bill but to produce on a larger scale I would suggest getting containers from a dedicated glass company.
Second, quality control is lacking. I would say that one jar out of every case I ordered had some deformity that made it unusable. Some had dents. Some were more square than circular. The diameters were not the same, etc... They just seemed pretty cheap and there were a fair number that I kept just for testing bc I didnt feel comfortable selling them. I do like the overall design and have searched for them elsewhere, but I have no desire to buy these particular jars again.