Love these! I use them for lip balm. Some think they are too small but I think they are the perfect size. They are small enough to stick in your purse or give away as samples. I'ved used bigger (5G) size and they are way too big. I am still using one I made a year ago in the bigger one and haven't made a dent in it. :) As for the quality of these. They are a hard plastic. All the lids fit fine. I had no problem with any and got the amount I was supposed too.