Have ordered these nylon floor, on the recommendation of the previous speakers and I am really satisfied: simple installation and operation via velcro, easy to clean, and it fits well with other freewheeling models z.Bsp. Do I simply omit two grid elements in my freewheeling. In addition, the animals on cold stone floor a protective pad, the roughened nylon provides good grip, z.Bsp. small guinea pig feet. For this, a real fair price. Einn really innovativbes product has earned the five stars !!! Addendum: Have the freewheel now only a few months in use and noted today that you can wash it also prima in fine stage in the washing machine !!!