Never hot or cold, sticky or 'icky', the MouseRug's surface is made of millions of individual soft nylon microfibers with air space between to provide the most beautiful and comfortable mousing surface on the planet. 25.5cm x 18cm. Inspired by a centuries-old Persian confederacy pictorial rug design from the Fars province in the south of Iran, these rugs were originally made for the court and great nobles and were presented only on special occasions.