Evans System Blue tenor heads were designed in cooperation with the Blue Devils percussion staff and feature a 2-ply design with 7mil top-ply and 7.5mil bottom. This combination delivers tonal clarity and projection while also increasing durability and pitch stability, reducing the need for frequent tuning. The series also utilizes Evans' unique Sound Shaping Technology™, a damping technique that targets unwanted overtones and provides the control needed to enhance attack, projection, and note definition. The damping pattern on each head also provides a visual reference for the optimal 'playing zone' for each drum, offering a target for less experienced lines.