These are GREAT! They are nice and thick, stay in place and easy to install! No sticky messes! Rubber backed for non slip safety. 
I used them on my front staircase in my 200 year old home! The stairs are so much quieter now and much softer to walk up on.
*Note: I did order 2 sets and the gray on each set is different. 1 is light gray and the other is darker. I just alternated them to blend better.

Highly recommend! Pairs nicely with the runner seen in the pictures!