You use these to make the wires along the back and bottom of your computer desk more manageable and tidy. It has a slit that runs along its entire length that lets you merge or part wires out of it easily. It also works well for power tools and aquarium setups. I have several lengths of the stuff: Gray (as pictured) 1" diameter, 8ft length Black 1" diameter, 16ft length 1.75" diameter, 6ft length Orange 1" diameter, 3ft length Take the whole bundle for $10 or if you need a smaller length from above I could give it to you for $5. Ok, maybe the orange for $2.