Product Information: Vintage look meets a modern sound. Calftone drumheads are made using a 12mil Mylar base blended with unique materials to give you a classic warm, full, and rich tone. These drumheads feature a fixed internal overtone control ring and can be used as both a batter and resonant head. Product Features: Calftone is a synthetic alternative that embodies the look and sound of traditional calfskin - for resonant and batter use. Made using a blend of unique materials to produce warm, full, and rich tones; for resonant or batter use A fixed internal 10mil overtone control ring focuses the tonal response of the drum using a blended 12mil + 7.5mil Mylar to be a single-ply. Bring out the best of a vintage kit and evoke a classic appearance and sound from a modern drum All EVANS drumheads are designed, engineered, and manufactured in the USA For more information and specifications, please refer to the manufacturers website