Carlisle 40424 Sparta boot ‘n shoe brush helps eliminate bacteria, refuse, dirt and other contaminants from being tracked into the building. This brush sits on a chrome steel tube frame that can be securely bolted to the floor for added security. It is very important to pick materials that will not absorb bacteria; therefore, Carlisle used non-absorbent plastic to make the brushes. The material used to make the brushes are BPA free and FDA approved. – Sparta boot ‘n shoe brush- Black polypropylene bristles- Chrome steel tube frame- Non-absorbent plastic block- Steel scrapper for removing heavy debris- BPA free and FDA approved