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. Product Type :Instrument Parts And Accessories Package Dimensions :18.0 L X18.0 W X2.0 H Country Of Origin :United States Package Weight :1.0Lbs Item Weight 15.5 ounces Speaker Diameter 40 centimeters Item model number PDS216 Product Dimensions 17 x 1 x 17 inches Is Discontinued By Manufacturer No