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
Diamond-Grip" Rubber Stair Tread
Stair Treads - Rubber, 36 x 12", Black H-5881BL - Uline
Stair Mats – Regal
Amazon.com: FINEHOUS Rubber Stair Treads Non-Slip Outdoor 35”x10” (5-Pack) – Anti-Slip Step Mat with Nosing : Tools & Home Improvement