There is no difference except the stiffness, CAB binding is stiffer (loaded with 10% of glass fiber) and K1 is more flex (loaded with 5% of glass fiber). So CAB bindings are more responsive and more adapted to good riders or heavier boards. K1 bindings are flex, provide forgiving response and are much adapted to begin. If you want to learn more about the bindings, go to BindingTech. http://www.spinskateboards.com/bindingtech-1.php