Mike to add just a bit to what XS said. PoweriZer pros/upwings/basically the new model are the only ones sold with carbon fibre springs ( and they are black/charcoal in colour). However, it is possible to 'obtain' the springs seperatly as replacements for worn out glass fibre springs. This is what seems to have happened here.
Lidor, I back up Sprog on the issue of CF strength. CF is stronger than GF. But strength is not all that is needed in a spring, there has to be some 'give and take' in the flexing when jumping. At the moment there are some issues with some springs being too stiff and therefor liable to cracking.
Now the CF issues may well be licked ( well will have to be cos a great deal of money will have been invested) and all that arrive on the market are OK now. I will say that CF is not sold by UK retailers and I gather isnt going to be until they are satisfied. But it is sold in other countries and some are seeping into the UK. I certainly know of brackages in Germany, Austria ( well an Austrian in Sweden at the time) USA as well as UK.
But just to even things up a lil -- I had 2 bits brake on 1 of my 7's today

. 1 cosmetic, the other is the horizontal bar under the footplate that attaches to the stabaliser rods --sheared off
