aaah, but both being particle balls one heavy and one light loads doesn't mean that they don't/won't work for HB. He may have had not so good luck w/particle balls from another company, but not LM. Plus, if everyone here has good things to say about the Term/WCPP, there's something to be said about that. If they don't work initally for him, there's always a touch more polish available to . . . facilitate a better reaction, especially if he's on the slower end of slower/moderate speed. But if he's bowling on med-heavy, he probably won't have to do much changing at all -- but particles + light oil w/no surface adjustments = corner pins beware/headpin completely safe.