Wrap your cables around these to shorten their length. It helps to keep your spaces tidy. Could also be used as a device to store your ear buds.
There are 3 sizes, Large, Medium, and Small.
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Just print it on a 3D printer and you're good to go.
Here is my intention for each one, but you can use them on whatever fits:
Large: For beefy power cables
Medium: For USB cables and the like
Small: Smaller power wires (from wall warts)