These extremely unique drums feature a "shell within a shell" design. The outer shell holds all the parts (lugs, strainer, butt, etc) and also has outside holes which allow the drum to breathe. The inner shell has no holes and no parts attached, so it resonates independently from the outer shell. Both top and bottom bearing edges also have vent holes. These "edgevents" work with the outer shell vents, creating a unique voice that translates into a fat, warm sound with excellent attack and sustain. These drums have a truly different look and sound that is worthy of the Spaun name.