They come in different sizes, also, you can wrap them around thick wires. I used them for the cablework in the workshop too, up to 2" diameter.
There are other types of protectors, ribbed, slotted tubes of plastic, for heavy duty use. Or you can cut installation tubes, they are rather cheap. Don't know the correct english expression, but the flexible tubes you put into walls to route wires through later.
I've used mostly garden hoses cut to length, slit down one side. They generally don't require any fasteners (although I use zip-ties on some of them), can fit multiple wires, come in many colors (I got tan ones that match my carpets), and are cheap. 1 $8 hose was more than enough for my whole house! Must be something about the rubber in them, but the boys take absolutely no interest in them, and haven't even tried to nibble in 3 years!
Similar to the hose idea I’ve purchased clear tubing from my local hardware store they are easy to cut to length worked great on my large surge strips and cords that wouldn’t fit into normal cord organization.