This is a tea infuser from Eva Solo, a Danish kitchenware brand founded in 1913 and a representative of Scandinavian design. I received this as a souvenir, and if this information is incorrect, please let me know. I believe it can be used for black tea, as well as green tea and Chinese tea. I haven't had a chance to use it, so I've been storing it away. I would like to sell it to someone who can use it. I believe it is unused, but it has been stored in the kitchen for a long time without being in a bag. There are some scratches. There is no original box or instruction manual. It will be shipped via Yu-Packet Post Mini. Product Name: Tea egg Color: Black Materials: Stainless steel, plastic How to use: Press the metal part on top to open it and remove the top. Use the tea egg like a spoon to scoop up the tea leaves. Put the top back on, place it in a cup, and pour hot water. This is a smart and practical item that combines a teaspoon and a tea strainer. This item has been stored at home for a long time by a non-professional (no pets, no smokers). Thank you for your understanding.