2. The first aluminum pressure cooker is cheap and durable, but the food made with it will contain more aluminum, which will be bad for your health after a long time.
3. The second kind of pressure cooker made of aluminum alloy avoids this, and it is also very light and cheap. At the same time, heat conduction is very fast, and cold water can be directly used to cool down after use. Only the pressure cooker made of this material can't be used in the induction cooker.
The last stainless steel pressure cooker, the price is the highest among the three, but it is very durable and can even be used for decades. And can be used on an induction cooker.