ZWILLING Milk Frother This stainless steel design allows for both heating and frothing. - Brand: ZWILLING - Product Name: Milk Frother - Color: Black - Materials: Stainless steel, plastic - Functions: Heating function, frothing function - Operation: Button-operated Used only once. The sound is quiet. I bought this to make Dalgona coffee. I frothed coffee with it, so there is some staining and the smell of coffee on the attachments. There are no problems with its use. Since the frother is faster, I am selling this one. Please refrain from price negotiations due to shipping costs. Thank you.