I have kept this in storage without using it. It has been sterilized, but please understand that it has been stored in a household environment before purchasing. [Product Description] The HARIO Whipped Creamer Slim is a kitchen tool for easily making whipped milk. Its compact design makes it convenient for storage. [How to Use] Heat milk in the microwave and move the creamer up and down to create fluffy whipped milk in a short amount of time. It's perfect for cafe lattes and cappuccinos, to match your favorite drinks. [Features] Made of heat-resistant materials and designed for ease of use. It's an item that allows you to easily enjoy a cafe atmosphere at home. - Model Name: WHIPPED CREAMER SLIM - Brand: HARIO - Function: Milk Frother - Capacity: Approximately 300ml - Materials: Glass, Plastic - How to Use: Heat in the microwave, then move up and down to froth