CM1200-1026 , CM1200-1028 , CM1200-1027
NCY Compression Spring (GY6), 
Black 1000 rpm
Yellow 1500 rpm 
Red 2000 rpm

$14.99 Shipped in the US.

Compression springs do a couple of things. First they supply the pressure to engage the belt. 
They also determine the rate at which the CVT transmission changes from low to high gear. 
A 1000rpm spring will go into a higher gear than a 2000rpm spring.