The četvorka is created by drilling four holes in one piece of wood.  However, it is impossible to sound all of the four pipes simultaneously. The pipes (i.e. the reeds) are usually not even made on the same side, but on opposite sides, two by two. On one side there is a dvojnica, and on the other side a sluškinja. Specimens in which the sluškinja and the dvojnica are made on the same front side are very rare (see photo).