This is a rubber band that is used to connect several passport size refills. By combining several notebooks, the way in which you can use the
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Traveler's Notebook Refill 011 - Passport Size - Connecting Rubber Ban - Paper Plus Cloth
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Use these rubber bands to insert refills into the passport-size Traveler's Notebook. Comes with four bands - 2 black, 2 brown. Made of silicone
Traveler's Notebook Passport Size Refill - 011 Connecting Rubber Band