Predator® V-belts contain kevlar tensile cords, which stretch only a minor amount. Therefore, multiple Predator belts that are not the same length will not "equalize" during the run-in period. So, to ensure that the belts properly share the load, Predator belts should be ordered with the same group (or punch) number.
The photos below illustrate the location of the group (or punch) number. The number will be stamped in gold color next to the transfer label on the Predator belt or next to the content label in black ink on the outside of the carton.