The RC-Series Renaissance Clear Aluminum Insert Timpani drumheads are the ultimate in warm, dark, focused tone, with dynamic sensitivity and full-range projection for the most discriminating Timpanists. Featuring a unique, specially treated Clear 7.5-mil film combined with an Aluminum Insert ring for added tuning stability and projection, Renaissance Clear Aluminum Insert Timpani drumheads provide the look and feel of calfskin with unparalleled strength and consistency. Designed by the world's top Timpanists and tested in the world's top Concert halls, Renaissance Clear Aluminum Insert Timpani drumheads are the industry standard for professional Timpanists and Timpani manufacturers worldwide. With the perfect combination of performance and durability, these are the best-selling synthetic Timpani drumheads in the world. Available in extended collar sizes 22", 25", 28", 31" and 34". Other sizes 20" - 35" available by special order.