10 RESONANT DRUM HEAD MADE USING A SINGLE PLY OF 10MIL FILM. A SINGLE PLY OFFERS AN OPEN AND EXPRESSIVE SOUND. A SINGLE PLY OFFERS AN OPEN AND EXPRESSIVE SOUND. IDEAL FOR ENHANCING TONE WHEN COMBINED WITH A 2-PLY BATTER HEAD. EXCLUSIVE LEVEL 360 TECHNOLOGY COLLAR DESIGN ENSURES PROPER CONTACT BETWEEN DRUM HEAD AND DRUM SHELL.