Drumhead, batter, 13". Calftone drumheads are a synthetic alternative to traditional calfskin. They embody the look and sound of a natural skin but with the consistency, fit, and tuning range made standard with Level 360 Technology. These heads bring out the best of a vintage kit and evoke a classic appearance and sound from modern drums. Calftone drumheads are a synthetic alternative to traditional calfskin. These heads embody the calfskin look and sound but with the consistency, fit, and tuning range made standard with Level 360 Technology. Made with a 7mil film base and blended with unique materials, these heads are thinner than our bass heads to help optimize the sound for smaller drums, higher tunings, and greater tonal response. They bring out the best of a vintage kit and evoke a classic appearance and sound from modern drums. Diameter: 13".