Stair Treads Collection Set of 13 Indoor Skid Slip Resistant Carpet Stair Tread Treads Black (8 Inch x 30 Inch) (Black, Set of 13) Olefin / Polypropylene Made in USA or Imported Face: Polypropylene. Back: skip slid resistant rubber bucking Made in the USA! Protects your stairs with tough construction. Suitable for high traffic areas. Adds traction, helps reduce slips on your staircase.