I believe the "core" is the little hub which fits into the hole in the center of the roll of tape. The core has little axles which stick out a fraction of an inch and hang in the little notches on the inside of the dispenser. If you look carefully at the picture you should be able to figure it out. Anyway, the core is next to useless without a dispenser, but if you already have a dispenser, then extra cores can come in handy for holding different types of tape, allowing quick changes.
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