Arrived early, which was great! 
I agree with other reviewers about the treads being folded in the box and so they do not lie flat on the stair treads.  Hopefully with time they will flatten out. A longer shipping box would solve this issue.
Although they have a rubber backing, they move on our wood treads so I will have to find a solution to keep them in place.
Otherwise, I purchased them so my dog can navigate our slippery stairs easier and they definitely help him!