The TC-Series Hazy Steel Insert Timpani drumheads provide outstanding projection and sustain, with bright, focused sound and enhanced articulation. Featuring a 7.5-mil Hazy film combined with a Steel Insert ring for added tuning stability as well as enhanced sustain and projection, TC-Series Hazy Steel Insert Timpani drumheads provide the ideal combination of projection, sustain and focused attack, making them ideal for outdoor use, especially for Marching applications. Available in extended collar sizes 22", 25", 28", 31" and 34". Other sizes 20" - 35" available by special order.