TO be perfectly clear (some people are getting confused on this way too much)...
The Black Model are the EXO Standard. The silver model are the EXO Pros.
On the side end of the box they come in, a round sticker will be placed on the category of stilt you have, indicating which model (standard or pro) and which weight category you have.
On the actual stilts themselves, the only way of telling what weight they are is by looking on the bottom end of the SPRING where a number is hand written with a marker pen.
So if your springs have 76 written on them then they are CZ70's
and so on...