To be honest, I had my doubts about these treads. The site showed that you peel off the film backing before placing the treads on the stairs and I was worried they would have an adhesive like  backing. I was wrong. The backs are thin individual tracks of a rubbery substance that really holds but you can still lift the treads to adjust placement and there is nothing left on the stairs. They have held up through people traffic as well as dogs and cats without movement.  I am more than pleased.