Product DescriptionThe 10mil single-ply clear Genera Resonant has produces a full and round sustain with strong upper-mids that increase projection without sacrificing sustain. They're ideal for enhancing tone when combined with a 2-ply batter head.From the Manufacturer Genera Resonant Series Overview Evans clear Genera Resonant drum heads produce a full, round sustain with strong upper-mids that increase projection without sacrificing sustain. They are ideal for enhancing tone when combined with a 2-ply batter head. The revolutionary Evans Level 360 drum head technology is found in the proprietary collar design that extends the level playing surface of the drum head 360 degrees around the drum. This vertically enhanced collar design ensures balanced contact with the critical bearing edge of the drum shell, resulting in: ? Ease of fit ? Ease of tuning ? Extended tuning range and quality of sound Available on all Evans 6 - 20 inch Batter and Resonant Drum set, Snare Side, Concert and Marching Tenor heads. Evans Level 360 technology solves the age-old dilemma of traditional synthetic heads consistently not fitting a variety of drum shells without using force that chokes the responsiveness of the head and the drum?s performance. The Level 360 Blueprint The benefits provided by Evans Level 360 technology stem from a groundbreaking collar design: Steeper Collar:Extends the level plane of the drum head to ensure balanced contact with the critical bearing edge of the drum shell. Roll-over Hoop:Provides strength and stability where the film meets the hoop, for greater durability without diminishing performance.Balanced Contact:For ease of tuning and enhanced quality of sound. Greater Tonal Range:Wider tuning options result in higher levels of responsivness and resonance, giving you the confidence to tune your drums high or low.