Aquarian Super-2 Coated 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 drumheads react. Aquarian includes a tuning sheet with each Super-2 coated drumhead.