13" tom batter drumhead. Calftone is a synthetic alternative that embodies the look and sound of traditional calfskin. Made with a 7mil film base and blended with unique materials to produce warm, full, and rich tones. Exclusive level 360 technology™ collar design ensures proper contact between drum head and drum shell. Evans Calftone drumheads bring out the best of a vintage kit and evoke a classic appearance and sound from modern drum.