From Aquarian:
The American Vintage is a coated single ply drumhead. Made in thin and medium weights, the American Vintage Series Drumheads have a slightly larger hoop diameter to allow for an easier fit on most older American made drums that have a hard time fitting conventional heads. This specialty line of drumheads features a unique vintage coating that is slightly thicker and has a look, a feel and the warm sound of a calfskin head.
Ply: 7 mil
Size: 18″