Stair Treads Collection Set of 9 Indoor Skid Slip Resistant Carpet Stair Tread Treads Black Color (8 Inch x 30 Inch) (Black, Set of 9) Face: Polypropylene. Back: skip slid resistant rubber bucking Made in the USA! Adds traction, helps reduce slips on your staircase. Protects your stairs with tough construction. Suitable for high traffic areas.