Individual tires for standard wheels (4.80 / 4.00-8), Semi / Midi wheels (16 / 6.50-8), Kenda Beach Racer wheels with 9 grooves or Bigfoot wheels (21 / 12.00-8) as Slick or with 7 grooves.
Tires for BigFoot are equal for all BigFoot variants.
Depending on rim type you maybe also need tubes for mounting the tires.