If you are a business owner that loves to keep customers happy, this is not good for business. I actually placed 5ml of water in a syringe and tried to place it in the bottle because I couldn't believe how much smaller they were from my original 5ml bottles. As you can see in the photos my original 5ml were clear with white tops and I wanted to jazz it up with adding a little color like my new customer favorite 10ml bottles. Big mistake! The glass is so thin, one drop and I'm certain it would shatter. You can see for yourself in the picture how much thinner it is by the bottle base comparison. Dangit I ordered 6 cases of these to fill my next big batch. Returned immediately!!! No second thought. I have a reputable business to run. Next!!!