Evans Strata series timpani heads feature a smooth calf-colored coating designed to prevent timpani mallet wear and enhance the sound of the head. Strata s warm tone clarity of pitch and articulation blend naturally with any ensemble. All Strata timpani heads are pre-tensioned with a black powder-coated insert ring for tuning consistency and additional hoop support. 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. 25 inch Strata Timpani drum head Pre-tensioned for tuning consistency Features a smooth calf-colored coating to prevent mallet wear and enhance sound Perfect for students and seasoned professionals alike All Evans drum heads are designed engineered and manufactured in the USA