Out of curiosity, what's the difference between Pinstripes and Powerstrokes?
Pinstripes simply have the ink around the head, 7mil on both plies. I don't know if that's all Remo does for muffling or if there's an additional muffling element inbetween the plies, between the hoop and the ink circle, but eh.
Powerstroke 3s are single ply 10mil heads with a little muffling ring tucked inside the collar. Powerstroke 4s are two-ply, but I'm not sure of the thickness of the plies. Probably 7-mil on both.
Powerstrokes generally have more muffling.