Single Speed (1/8”) Bicycle Chain (usually works with multi-speed bikes, too). Comes with 2x master links. Will send a length slightly longer than needed- so you will need a chain breaker tool, or if not, grind off an outer link to be able to separate the unneeded extra length.
The width (1/8”) of the chain is sized for single speed use, but I have used it many times on bikes with 6 or less gears with 100% success.