Aquarian Super-2 drumheads sound louder, fuller, and more powerful than conventional two-ply heads, with the added over-ring control and focus of Studio-X Rings. They have great attack, projection, and depth unlike any other drumheads. The patented Safe-T-Loc hoop prevents the head from slipping and the "Sound Curve" collar design provides "Responsive Tuning." With "Responsive Tuning," one turn of the drum key and Super-2 heads react. A free tuning sheet is enclosed with each Super-2 drumhead.