I wanted to show some things I could not detect or determine prior to purchase.
The retaining cord is not what I would describe as paracord, though it has that appearance. It's flimsy, no body to speak of; in fact it's stretchable. At rest the overall length is 29 inches, but will stretch to 33 inches. Wish the cord were paracord, but oh well.
Since I put on and remove these straps from my eyeglasses quite often the convenience factor was something I considered. I downloaded three images to show specifically what the rubber ends look like on and off the temples. One image is taken from the len's point of view, toward the temple tip or earpiece; the second image is taken from behind the earpiece. The third image shows both rubber ends of a single retainer strap. It's this third image that best shows the two different portals or slits in which the temple tips are inserted. Each rubber end on the strap has both the larger opening as well as a slit, essentially a 'front' and 'back.' For the way I use an eyeglass retaining strap this is a nice functional design feature, making them easy to get on and why I would purchase again.
The larger opening is nice in that you don't have to stab at or pinch the rubber to get the temple tips inserted. (I have a Chum's brand strap and have to work to get the earpiece started.) By way of comparison the Koala's rubber is more robust or rigid and due to its secured tight grip stays in position once on the temple. They don't have to be adjusted, not that you could adjust them if you wanted. Note that the temples of this pair of glasses is square or just slightly rectangular. I image they might react differently on round temples or a lighter weight temple, but that's obviously just conjecture though I think sound reasoning.
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