Calftone drumheads bring a natural aesthetic and vintage sound to modern drum sets. Evans Calftone bass heads are made using a 12mil Mylar base, blended with special materials, to create a synthetic calf skin, which embodies the classic warm, full, and rich tone of real calfskin. This bass head has a balanced attack, medium bright character, and moderate sustain. This synthetic calfskin head also features Level 360 Technology.