Standard shaft stiff and light.  Hybrid cofab braid of Carbon, Kevlar and S-Glass yields the ultimate strength/weight ratio.  If you like light and responsive, this is your paddle 

Flex shaft 25% more flexible shaft.  Hybrid braid of Carbon and S-Glass for those who like a softer feel. Designed to simulate the natural flex of a wooden shaft.  Helps lessen stress to joints even more.