Ottomanson Easy clean, Waterproof, Low Profile Non-Slip Indoor/Outdoor Rubber Stair Treads, 10 in. x 30 in. (Set of 5), Gray RDM8133-5PK - The Home Depot
Amazon.com: FINEHOUS Rubber Stair Treads Non-Slip Outdoor 42”x10” (5-Pack) – Anti-Slip Step Mat with Nosing : Tools & Home Improvement
Rubber-Cal 6- Piece Stars Step Mat Rubber Stair Treads, 9.75 by 29.75-Inch, Black - On Sale - Overstock - 9965906
Rubber-Cal "Diamond-Plate Commercial" Step Mats - 2 Sizes - On Sale - Overstock - 27735544
Rubber-Cal 6-Piece Stairs 3/4-ft x 2-1/2-ft Rubber Black Indoor/Outdoor Stair Tread Rug in the Rugs department at Lowes.com
Stair Tread Mats
Diamond-Grip" Rubber Stair Tread
Amazon.com: Ottomanson Indoor/Outdoor Hose-Wash Holes Design Non-Slip Rubber 10" x 30" Modern Stair Treads for Stairs, Garage, Patio, 5 Pack, Black Holes : Tools & Home Improvement
Outdoor Recycled Rubber Stair Treads are Outside Rubber Stair Treads by American Stair Treads
Project Source Onyx Outdoor Utility Mat in the Mats department at Lowes.com