Stair Treads Collection Set of 7 Indoor Skid Slip Resistant Carpet Stair Tread Treads Black (7 Inch x 24 Inch) (Black, Set of 7) 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.