I wonder if these D-Stix were like plastic Tinkertoys or something. An eBay auction describes these: "A CREATIVE 3-DIMENSIONAL CONSTRUCTION SET FOR 'ENGINEERS OF ALL AGES'" ... THERE ARE LOTS OF DIFFERENT SIZED PLASTIC STIX FROM ABOUT 3" TO 8"(A FEW ARE BENT). THERE ARE EIGHT OF THE 5 PRONGED RUBBERY CONNECTORS AND SOME SINGLE RUBBER TIPS." It looks like you could make Buckyball models with these.