Bi-level surface effectively scrapes dirt and moisture from shoes, trapping it beneath shoe level to prevent tracking. Reinforced rubber nubs prevent pile from crushing and extend the performance life of the tiles. Fade and stain resistant solution-dyed PET fabric is resistant to staining, dries quickly, and will not fade or rot. Certified high-traction by the National Floor Safety Institute (MFSI). Eco-Friendly PET fabric is made from 97% recycled content reclaimed from plastic, and SBR rubber backing contains 20% recycled rubber from car tires. Ideal for surface or recessed installations. Tiles can be installed inside or outside; solvent-free adhesive is required for installation (sold separately). Worn or damaged tiles can be easily replaced. 18" x 18" x 1/4".