You buy carbides for C&A skis, just like any other set of skis polaris/cat/doo, etc.....
I swear by the C&A's, have been using the brand for 5 or so years now, love them. If you are getting them for your 440 all you need is the "advantage" version, nothing more aggressive than that.
03 Pro-X 700
C&A's - 144 studs
clutched - SLP air box mod
handguards. Rumble Pack Silencer
MINT
98 XC 700, 220 jugs, 144 woodys,
C&A Ultra II's, Clutched, Power Packs, Boostbottle, Boyesen Reed Petals
SPOTLESS