I agree with Skypig -- pick some up, they're around $10ish last time I checked.
I still think it's possible to reproduce these, but it's going to be a pain in the butt. Here are my thoughts on the matter:
- Take some glass tubing of the appropriate diameter. Heating it over a flame close and finish one end like the bottom of a test tube (rounded)
- Heating it over a flame, mostly close off the other tip, although you'll be closing it off in a point.
- Fill with iodine (is iodine flammable?)
- Close off the end. You're going for a pointed end that can easily be snapped off.
- Take some tubular shoelaces in an off-white color. You'll need to cut them to the correct length after sewing across the lace twice (I believe once with red thread, once with blue thread).
- Slip the lace over the iodine glass from the pointy end.
- Dip in hot wax. I'm assuming this step would adhere the lacing to the glass, but it may not.
- Wrap your reproduction label around the lacing and dip it again.
These little iodine things are complicated. Again, if you really want to reproduce them, purchase some originals and study their construction carefully. I don't think measurements alone will get you there.