The Tre is a series with a simple idea behind it: offering an obvious answer for those who seek a Savinelli pipe without the usual (for Savinelli) filter-or-adapter tenon. Though every Savinelli made to accept a 6mm balsa filter comes with an adapter for filter-less use, some pipe smokers just prefer a tenon drilled to 3mm from the start; this leads to them asking around (on forums and such) as to which Savinelli series come this way by default. Now they don't have to ask around. The answer is right in this line's name: Tre, Italian for "three".