I am not sure anyone really knows, I am pretty sure it is not an even mixture tho, I have been told it is tweaked somewhat. Based upon what I have seen, I am leaning towards more activator, less pk18. I only say this as it appears to float thru the heads quite well and still read thru the carrydown, ALA activator and its derivatives. PK18 is a strong midlane cover, especially in a solid version