The Fingertip Mats Brushing Action Of Thousands Of Resilient Rubber Fingertips Wipe Off Dirt And Moisture From Footwear. Dirt Is Trapped Out Of Sight Below The Walking Surface. Corrugated Pattern On The Bottom Helps Prevent Mat Movement. All Four Sides Have Beveled Edging To Improve Safety At The Facility Entrance. Shake, Vacuum Or Hose To Clean.