on the box they say carbon and alloy - i do have some blacks there too though - don't know how i got those thoughThe Swissstop Yellow are for carbon rims, incase you didnt realise.
I use Swissstop Black on my normal wheels and Yellow on my race wheels.
Koolstop pads are rubbish IME.
there about 3 rides old martin and have hardly any wear at all - there just rubbish at stopping on very steep descents in the wet. Yesterday i was scared to death descending some very steep mountains in south wales - back to the swisstop blacks that i used to have on my srams i thinkI use Koolstop Salmons as front pads and blacks on the rear. I've yet to have a problem stopping in wet or dry on them. If they're giving you problems in the wet, it may be they've worn down too much as they have a little raised bit that clears the water off the rim before they bite.