These cutter sticks can be used for either the Triumph 6550, 6550 EC, or the 6550 EP paper cutters. The polyurethane cutter sticks can be easily be rotated or changed from the outside of the Triumph cutters, without removing the machine covers. The sticks have eight sides and have a considerable life-span. It is always a good idea to have spare cutting sticks on hand in case your other cutter stick becomes unusable.