String needs to be B-50 or B-500 dacron. The bow was not built to handle fastflight (fastflight didn't even hit the market until nearly 20 years after that bow was made). Most dacron strings you find in a pro shop are 16 strands for hunting bows 50 lbs and up, and that's too heavy for a 35 lb bow. If it was mine, I'd make up a 12 strand string for it.