The TC-Series Hazy Aluminum Insert Timpani drumheads feature outstanding projection and sustain, with bright, focused sound and enhanced articulation. Featuring a 7.5-mil Hazy film combined with an Aluminum Insert ring for added tuning stability and projection, TC-Series Hazy Aluminum 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.