Ept ecoproteq anti rust technology kmcs latest breakthrough in rust protection ecoproteq treatment doubles the rust resistance compared to the rb treatment benefits of the smoother coating are less noise great performance maximum rust resistance and great look warranty the life of all kmc double x durability and triple x durability chains are guaranteed to last longer than other brands double x durability warranty includes all x sl x el x10e x9e x101 and x1 models if you are not