Product Description Strata timpani heads are pretensioned with a black powder-coated steel ring that makes the head easy to clear. They feature 7.5mil hazy film with a smooth calf-colored coating that promotes a warm tone and clear immediate pitch, which blend naturally with any ensemble. The Evans EST25 Strata Timpani head features a diameter of 25 inches. Evans recommends you carefully review the Evans Timpani Head Reference Chart prior to purchasing to be certain you are obtaining the correct size for your model timpani. 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.For over 40 years, Evans has been a pioneer of drum head manufacturing and design. Known for innovative designs such as EMAD, EC2S, and the Hydraulic series, Evans drum heads are made in the USA in a state of the art manufacturing facility. Acquired in 1996 by DAddario and Company, the global leader in musical instrument accessories, the Evans brand is synonymous with quality and consistency. From the Manufacturer The Evans EST25 Strata Timpani head features a diameter of 25 inches. Evans recommends you carefully review the Evans Timpani Head Reference Chart prior to purchasing to be certain you are obtaining the correct size for your model timpani. 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.For over 40 years, Evans has been a pioneer of drum head manufacturing and design. Known for innovative designs such as EMAD, EC2S, and the Hydraulic series, Evans drum heads are made in the USA in a state of the art manufacturing facility. Acquired in 1996 by D’Addario and Company, the global leader in musical instrument accessories, the Evans brand is synonymous with quality and consistency.