A small tubular pasta used in soups. Ditalini is made in a smooth tube or with ridges (rigatti). The name ditalini means "little thimbles". The classic use for this pasta is for Pasta E Fagioli, pasta and bean soup.
If you don't have ditalini you can substitute equal amounts of either of these which are very similar:
Or for soup making you can use one of these which are much smaller and cook faster: