Aquarian Super-2 Clear Drumheads have great attack, projection, and depth unlike any other drumheads. The patented Aquarian Safe-T-Loc hoop prevents the drumhead from slipping and the Sound Curve collar design provides "Responsive Tuning." With Responsive Tuning, one turn of the drum key and Aquarian Super-2 heads react. Aquarian includes a free tuning sheet with each Super-2 clear drumhead.