PS2 Controllers, bought 2 of them, both with the same problem! With pictures.

Guys I didn't know how to name the post but well, the issue is this:

I just bought a PS2 Slim 90001, the last one. Here in my country, from a very reputable guy, the console was really great, hardly a scratch, reads everything (plus backup just great.

It came with two controllers, both in very good condition, you can tell in the analogue rubber, it has not being used much (it's texture is like a brand new controller) you know? the part that gets sticky and oily? The rubber part is like...

PS2 Controllers, bought 2 of them, both with the same problem! With pictures.