The replacement neck lanyard has a comfortable 32” neck loop that fits all Hoodloupe models. The quick release feature allows you to hand off your HoodLoupe to a friend without taking the lanyard off of your neck. For older HoodLoupe models, the cord with cinch fitting replaces the rubber O-ring for a much more secure mount. For newer HoodLoupe models, the cord with cinch is removed and the thin loop remaining slips through the eyelet on the HoodLoupe. For a few dollars more you can upgrade your Lanyard to a retractable Lanyard called Link.