Pick your range and you will receive 5 assorted jets from that range.
For example, if you choose 60s you would receive 60, 62, 64, 66, and 68. Or you might receive 60, 63, 65, 166, and 68. So numbers may vary just a little but you'll still get a good range.
If you want a specific jet, you should purchase an individual specific jet. These packs are to help you tune in your bike.
These are commonly found in PHVA series on mopeds.
You find these in the stock Bye Bike carburetor and on late model Tomos mopeds with the A55 engine.
No returns on jets. Sorry.