Product Information: Vintage look meets a modern sound. Made using a 12mil Mylar base blended with unique materials, the EVANS Calftone bass drumheads give you a classic warm, full, and rich tone.Can be 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 or batter use. Made using a blend of unique materials to produce warm, full, and rich tones 12 + 7.5mil Single Ply Mylar plus a 10mil overtone control ring 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