These are starting in my list to buy again when needed. Every other adhesive-backed rubber cable fasteners I've tried either fall off within a week at best and a few days at worst or stretch too easily and the cable just falls too the floor.
These not only ate high quality, "not-flimsy" rubber, but actually takes effort to get the cord or cable threaded, and it does not easily pull out like others by just handling /plugging phone in/etc.
Also, the ADHESIVE is not a cheap 3M "substitute"... It is NOT MOVING. I even keep one off my Samsung S-Pens in the corner hole, and pull it out/ push it back in regularly without even a hint of coming loose.