MAXIMA CRYSTAL IVORY IS THE SAME AS ULTRA GREEN WITHOUT THE GREEN DYE.THE MAXIMA REP IS A FRIEND OF MY SONS AND HE GAVE US THE INFO ON CRYSTAL IVORY A FEW YEARS BACK. MY FAVORITE LINE IS SUFIX, WHICH IS THE COMPANY THAT MAKES IZOR LINE.POUND PER POUND IT IS STRONGER THAN MAXIMA U.G., HOWEVER U.G IS AWSOME LEADER MATERIAL.