The flexible bands are what make the Vertical Spice Drawer Units unique and provide the great and easy access to spices.
The bands are 2 mm in diameter with black polyester over a rubber core, crimped into a loop. Very similar to mini bungie cords or elastic hair bands (pony tail bands). We found our prototype material at a Joann Fabric and Craft Store and now have a vendor form the loops with a similar product. We stock bands as "Accessories" for future replacements.
We have bands on the prototype units in our kitchen that are 5 years old and still performing. Yes they will wear out, but they are an inexpensive replacement that makes our product design like no other.