Paccheri in its main form is a large tube of pasta, shorter but much wider than cannelloni. A restaurant may also have a smaller version called mezzi paccheri, literally meaning half.
Paccheri is available in lisce (smooth) and rigati (grooved) versions, all depending on how you wish the pasta to take a firm hold of the sauce.
This makes for a wonderfully light lunch with a cool crisp glass of Soave.
Download the .pdf from this link: Paccheri Alla Crabe et Prosciutto