The Jetset do not want to worry about having the right jet while tuning their mopeds. They want a full range and they want it now.
This Jetset provides one of every even 5mm jet in a series. This one is for #54 thru #124. That should cover what you are trying to tune. That is 35 Jets!
5mm jets are found in SHA, and PHBG carbs, the most common carbs used in tuning your moped.
Need some tuning advice? Check the Tuning Spreadsheet.