A separate insert in the pot solves a very real problem: when the pasta is done, you lift the insert out instead of pouring it off. It saves a step, keeps the pasta in place and makes it easier to save a little pasta water. The same principle works just as well for asparagus, where you can boil the stalks in water while the tips steam above.
The pot comes with an inner metal strainer insert. Made of stainless steel. 4.5 L. Works on all heat sources including induction. Dishwasher safe.