Aquarian Super 2 Drumheads 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. The Clear Power Dot version offers focused, deep, and solid sound.