These are great quality for the price, however, they have a very strong bitumen smell. I use these to cover cables over roads when I am doing live audio gigs, and I keep them in my van. Sadly, the smell given off by the rubber is very strong, so I can't store them in my van because the smell is very overpowering. I have to strap them to the roof racks of my van to keep the smell out. Aside from that, they are great. I'm sure if they were used in a permanent situation such as across a driveway, and left in the sun, the smell would dissipate.