1. materials: the manual milk frother is made of ABS, silicone and stainless steel, with a size of about 8.4 x 18 cm/3.31 x 7.09 inches, which makes it very easy to clean and the handle is also easy to grip. It is durable and heat resistant. 2. Pour the milk into the can, insert the plunger into the can, and secure the lid. Turn the knob for approx. 4060 seconds up and down until bubbles and milk mix, then pour out. 3.Economical, compact and lightweight: it is more economical than battery operated milk frothers and expensive espresso machines. This hand frother can be easily stored in a drawer or bag, making it perfect for coffee lovers on the go. It is dishwasher and easy to clean, making it perfect for coffee shops, households and coffee lovers. 4.Easy to use: this manual milk bubbler can produce rich foam in 60 seconds or less and can cover delicious hot and cold drinks without electricity or battery. It is convenient and practical without electricity or battery.