Black backing? what is the sl?

So i haven't been around for a bit.. lol.

i love my 4gb m6 but its too small i need an 8gb so i want to buy a new one. I remember there was suppose to be a new meizu m6 with a black backing and not metal. does anyone know what happened to this?

also, what are the differences in the SL and older versions.

thanks

The all-black M6s were special versions, they don't make them anymore if i'm correct. I have an 4gb M6 black-black, it's really nice

yeah there is an black black SP version of the player but what about a SL version? Wouldnt that be nice ? =)

Greetz