They aren't substituting for ABS. ABS continues. This is a substitute for the existing non-ABS, non-rubber parts. (You probably know that LEGO makes more tires

They aren't substituting for ABS. ABS continues. This is a substitute for the existing non-ABS, non-rubber parts. (You probably know that LEGO makes more tires than anyone else in the world.) Certain small parts are molded in a softer, non-ABS plastic, and PE is the replacement for that. Look for rubbery-feeling parts in existing sets.