
They have a design flaw and are made of thin/cheap plastic of not so good quality. both I broke before they were half used. I managed to fix one with a razor blade and tape but it's far from perfect. Other, higher-quality replacement straps are available for the selectric II, e.g. original IBM design b. actually cheaper than this product and c. made of thicker/durable plastic.

π₯ Logitech C270 Webcam: Crystal Clear Video and Superior Quality
183 Review

Smartphone Samsung Galaxy A50 4/64 GB, 2 SIM, black
82 Review

Apple AirPods Pro MagSafe RU Wireless Headphones, White
159 Review

Logitech HD Webcam C270: Crisp 720p Widescreen Video Calling & Recording (960-000694), Lightweight and Portable at 3.15 lb.
192 Review