ST = Super Tough. Precision-drilled holes around the outside of the drumhead reduce overtones and decrease sustain. Well balanced and fairly responsive for a thicker drumhead, the Evans ST gives a good attack.
Designed to be played hard and loud, two plies of 7.5mil film give this drumhead warmth, durability, and a big attack. It remains fairly responsive, especially when tuned medium or high. Great for heavier hitters who need projection. This head has a similar sound to the regular ST, but with less ringing and sustain. Capable of delivering big rimshots, this drumhead shines in loud environments, but is also very usable if things get a little quieter.
The Evans ST is designed for snare drums.