This is the HyperChiller rapid cooling tumbler. It can cool hot coffee or tea into a cold drink in just one minute. You use it by putting the container in the freezer beforehand, and it can be used about 3 times in a row. I've used it a few times, but I stopped using it and have been storing it at home. I'm selling it now to declutter. According to the official website, you can enjoy ice-cold sake like you've never tasted before by using it instead of a sake carafe. Brand: HyperChiller Color: Black Purpose: Rapidly cools drinks like iced coffee Compatible beverages: Coffee, wine, whiskey, tea, juice, etc. New ones cost about 9,000 yen on Rakuten. 【Size】Approx. 10.6 x 10.6 x 17.2cm 【Weight】Approx. 350g 【Capacity】370ml 【Accessories】None 【How to use】 As shown in the photos: ・Pour water into the inner and outer layers, close the lid, and freeze completely. ・After completely frozen, pour coffee into the groove in the center to cool it down quickly. This is a used item, so please refrain from purchasing if you are sensitive to such things. Thank you for looking.