The difference between .7 and .75 opens up so many more possibilities. Champion and Vitro Anacortes have a few 3/4" marbles but JABO and D.A.S. have a lot of shooter sized marbles out there in the world. I don't find WV swirl shooters made by other American companies beyond Alley and those mentionned. I know they are out there, but I never find them (that I can think of).