Please only buy when I have explicitely told you to do so. This fee is to change the price when a customer wants a saber customized or changed. In this case we ask customers to add the discussed number of custom fees to the basket.
An example: A customer is interested in a saber ready-to-ship, but want a covertech installed and a part of the saber turned silver again. The 15€ charge for that would be done by buying the custom fee three times in addition to the saber.