These glass jars are quite useful for so many uses. Personally, I have transferred all the different spices from their original containers into these and added uniform labels. I also have them in my craft room, holding beads, stickers, etc. The sticker on the bottom indicates they can be used to create candles. They have a plastic ring seal which holds the lid on securely, and the shape of the knob on the lid makes them easy to pull off. They hold about 4 oz liquid.