Walkers rigid plastic and therefore not planned to be cut to the desired size. The half-moon party although 23 cm wide + a rim of 3.5 cm. It protects the stairs from the wear of repeated passages. Vacuum these steps do not scratch at all. Anti-dérapentes barefoot or in slippers but not designed to prevent slipping of a dog. On board supplier, I will change louse a model more suited to my Greyhound moving up and down the stairs at full speed at the risk of leaving a paw!