Total 13cm Length, 3cm ball head. 40g for one. Total About 5 Colors For Option. If you did not remark the colors you want, we will ship out random-colors. If you're looking for a simple yet effective way to enjoy the benefits of essential oils, then look no further than a glass oil burner. Glass oil burners are designed to evenly distribute heat, allowing the essential oils to gently vaporize and release their scent into the air. To use a glass oil burner, simply add water to the bowl at the top of the burner and then add a few drops of your chosen essential oil. Place a lit tealight candle underneath the bowl and wait for the water to start boiling. As the water boils, it will vaporize the essential oils.syi