After i got stuck in the mud on my field with my truck and having to get a neighbor to help me out with his tractor, i decided to invest in a solution to not have to rely on others, as they may not be always available. They are in my emergency items tool box for the time i need them. They are made of rigid plastic with grooves to permit tires to gain traction.
Comes with case and mounting hardware if you want to mount on roof rack. I have a minivan so this is overkill for me. I got stuck once a few winters ago so I'm paranoid. Very heavy and large so not in vehicle now. Will put in trunk late fall. Really made for off road adventure.
Purchased these as a Christmas gift for my daughter who had asked for a much more expensive set. I figured for the price even if they worked once, they were worth it. She is very happy with them and the fact that I was able to get her more gifts because I saved money.
Josie O. 
