Details: Versatile chair mat with a lip is designed to protect both carpet and hard floor surfaces. Stud-Free coating offers twice the grip than standard deflector studs on carpet. Exclusive coating prevents mat from moving on hard floors. Duo mat chair mat provides durable protection from chair scuffs and caster damage for both carpet and hard floors. Design also features a classic, straight-edge finish. Mat is also green guard gold certified to stringent standards for healthier indoor air quality. Lip size is 25" x 12".