The Bloom & Flow pour-over coffee maker consists of a stylish glass carafe and a unique funnel insert which provides optimized bloom and flow of your coffee through the paper cone. Made in Germany with machine blown borosilicate glass for improved thermal properties, the Bloom & Flow carafe can be placed with liquid inside on a stove or over an open flame. It is also microwave safe. The silicone collar is soft to the touch and serves as an insulated handle around the middle of the coffee maker. To keep the coffee warm, replace the funnel with the lid after brewing.