You can also buy individual sections, but it made more sense to buy the 3 pack from a cost perspective. They link together well, and they are quite sturdy. Using them to cover a power chord that runs in the garage. Plenty of room in the 2 channels for 4 standard-sized extension chord (2in each channel). We don't really drive over them, they more or less mark where we should stop the tires of the car when we park... while protecting the extension chord we use to charge our EV. So I can't say how durable they are for running over them every day... we only do that on occasion, and it seems to be working well when we do. I did not give it 4 stars, because I cannot speak to the true durability.. but they seem really beefy...they are quite heavy.