It looks like a calfskin! It sounds like a calfskin! And it feels like a calfskin! But it's not calfskin, it's Evans '56 Calftone. Calftone drumheads are a synthetic alternative to traditional calfskin.
Evans 18" EQ4 Calftone Bass Drum Head BD18GB4CT
Evans EMAD '56 Calftone Bass Drum Heads
Evans UV EQ4 Bass Drum Batter Heads - Coated
Evans 56 - 20" Calftone Bass Drum Head - Used with Chrome Port Hole
Evans 16" EMAD Calftone Bass Drum Head
Evans EQ4 '56 Calftone Bass Drum Heads
