The patented Flatheadz drum hoops from Eccentric Systems Design make tuning easy with a gauge system that help keep a drum in tune by showing which lugs have backed off. The gauged hoop design provide measuring lines at every tuning lug to assure the head is pulled equally all around the drum. Use Flatheadz to precisely harmonize the distance between the top and bottom heads. Quickly and precisely re-tune any drum to the preferred "sweet spot" with confidence and consistency.