Inside a 9 Volt Duracell

I have taken apart a few 9 volt batteries in my day but never a Duracell. They are made a little different it seems. They are divided into 6 flat packs of 1.5 Volts each for 9 Volts. All the other 9 Volt batteries I have seen were full of little tube style batteries that look like baby AAAs.

Here is one of the cells taken apart. Black stuff, white stuff, gray stuff.

Just an interesting observation.