Evans Orchestral Series Timpani Heads are pre-tensioned for tuning consistency and have a black power-coated steel insert ring that delivers desired effect when pedaled and affords additional support once the head is under tension. It performs magnificently at pianissimo with soft mallets yet will not break up or sound harsh under the stress of triple forte. Through all dynamic ranges Orchestral Series Timpani heads retain definite pitch. Available in incremental sizes 19 -37 . For over 60 years Evans has been an innovator in drumhead manufacturing and design. As the creator of the first synthetic drumhead and other revolutionary products such as EMAD Hydraulics and the UV1 series Evans drumheads are designed with the intent of solving problems for drummers. Regarded for high quality and consistency all Evans drumheads are made in the USA and feature Level 360 Technology. 31.5 inch Orchestral Timpani drum head Pre-tensioned for tuning consistency Consistent performance at varying playing styles Perfect for students and seasoned professionals alike All Evans drum heads are designed engineered and manufactured in the USA