Supposed international champions on the string pack included (left to right):
"Jack Burg" Canada, doing two-handed Milk the Cow
"Alberto Lopez" South America, doing Rock the Baby.
"Ted Brown" U.S.A., doing two-handed criss-cross.
"Billy Schmidt" Europe, doing Man on Trapeze.
"Ricardo Cortez" Philippines, doing two-handed Loop the Loop.
All appear to be wearing (sleeveless?) sweaters with a Royal yo-yo top patch of some kind sewn on the front.
Whether any of these champions actually existed or not is questionable because there is little to no mention of them in any yo-yo histories. Regardless, this string pack design, with its pictures of people actually using yo-yos, is much more visually interesting compared to most other string packs.