Paper cutters (guillotines) operate by a knife cycling and cutting into a plastic stick. The plastic stick will develop a channel in it from where the knife strikes. There are a few different types of plastic that are used in cutting sticks. The different types are different colors.
Red cutting sticks are made with PVC and are of OEM Original quality, this is the type cutting sticks that ship with the machines from the manufacturers. They have a hardness rating of 80-82.