Sold as 1 Each. Clear Polycarbonate carpet protection mat to prevent carpet wear caused by chair casters. Incredibly tough polycarbonate. The ultimate in quality, clarity and durability. Will not crack, curl, discolour or smell. Provides ergonomic benefits for chair user by providing easy glide movement and reduced leg fatigue. Clear formulation allows the beauty of your carpet to show through. GREENGUARD indoor air quality certified