Heads that are warm, dense, focused, and with a clear attack in all tuning and dynamic ranges.The Evans EC2 SST Clear Batter Drumhead offers an edge control ring is mounted under 2 plies of 7-mil film. The EC2 drumhead controls vibration instead of eliminating it. It also dampens higher overtones, enhances low-end attack, and supports a broader tuning range.Evans EC2 Sound Shaping Technology (SST)Evans improved EC2 drumheadss contain Evans' exclusive Sound Shaping Technology (SST). Sound Shaping Technology allows the drumheads to be fully optimized for each individual size by varying the thickness and density of the damping material, ensuring greatly improved performance and tone across the entire kit. Unlike other heads that lack SST, Evans EC2s contain the ability to balance attack and tone for each size. The result is a drumhead series fine-tuned for attack, tone, length of sustain, and ease of tuning. Packed with a more balanced and pre-EQ'd sound across the full kit, the vans EC2 with SST will make your toms sound better than you ever thought possible.