Rubber-Cal 10-104-000-6PK Stars Step Mat Stair Treads In addition to natural rubber, these rubber step Mats have reclaimed rubber in them The cut-out Designs on the surface of these anti-slip Mats helps increase the traction given to feet. Use these stair treads to reduce the risk of accidents occurring Rubber prevents the formation of meld and mildew. Fittingly, this Environmentally friendly flooring can handle all that the environment can throw at it