Rubber nibs on back keep mat in place Mats are made from loop-pile, needle punched polypropylene for long life. Resistant to most mild acids, alkalis and even UV light. Carpet is permanently bonded to heavy-duty, contour-molded rubber base, making it perfect for high traffic areas. Mats feature a raised perimeter, forming a tray to trap water and dirt, preventing floor drainage. Choose from 4 convenient sizes. Available in 4 colors: -10 green, -53 burgundy, -70 slate, -120 charcoal. Overall dimensions: VAE23: 2W x 3'L VAE35: 3W x 5'L VAE410: 4W x 10'L VAE46: 4W x 6'L