The chanter is the melody pipe, played with two hands. Almost all bagpipes have at least one chanter; some pipes have two chanters, particularly those in North Africa, the Balkans in Southern Europe, and Southwest Asia. A chanter can be bored internally so that the inside walls are parallel (or "cylindrical") for its full length, or it can be bored in a conical shape. Note that "parallel" doesn't mean exactly parallel, it generally means "more parallel than conical"; there is no definite borderline between the two types.