The pop and glide walker ski pops on for easier mobility. Simply remove your existing tips and add the ski on to allow you to glide over carpet, tile or concrete. The skis will fit on the back legs of any standard 1 inch walker and are designed to last. Each package comes with 1 pair of skis.Designed to be used on the rear legs of Folding Walkers only, neither intended to be used on the front legs nor intended to be used on any other medical device or household item.To ensure proper fit take tip off of the rear bottom leg of the Walker and measure outer diameter of the bottom leg tubing.For proper installation remove rear leg tubes and remove existing tips. Place skis on hard flat surface and start inserting tube on an angle before straightening while simultaneously pushing down.