Evans EQ4 Calftone Bass Drum Head (18in) - BD18GB4CTCalftone 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. Calftone is made using a 12mil Mylar base blended with unique materials to produce warm, full, and rich tones. As an EQ4, a fixed internal overtone control ring helps focus the tonal response of the drum. Can be be used as both a batter and resonant head.