Cable Cord Cylinders
The cylinder-like feature at the end of your cord is the ferrite core. It has magnetic iron oxide, which is good for preventing high-frequency electromagnetic interference. It wards off weird noises when you make your phone calls!
Cable Cord Cylinders
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Apple Power Cord Wings
MacBook power cords come with wings at the bottom. You can pull them up, but what for? It turns out that you are meant to tie the cord around it to avoid messes, tangles, and accidents. How useful!
Apple Power Cord Wings