Ottomanson Easy clean, Waterproof, Low Profile Non-Slip Indoor/Outdoor Rubber Stair Treads, 10 in. x 30 in. (Set of 5), Black Nib RDM8113-5PK - The Home Depot
Ottomanson Rubber 2 X 3 Rubber Black Square Edge Indoor/Outdoor Block Industrial Stair Tread Rug in the Rugs department at Lowes.com
Heavy Duty Rubber Stair Treads | Diamond Tread Surface
Rubber-Cal, Inc. Stair Tread & Reviews | Wayfair
Stair Treads - Rubber, 36 x 12", Black H-5881BL - Uline