Quality Rubber Resource SOO824 Stair Tread, Rubber, 8" x 24" x 1/2"Highlights: Material: Rubber Size: 8" x 24" x 1 2" 1 2" thick Heavy duty stair treads made from 100 percent recycled tires Designed to secure your steps and make them safer, even in the worst weather conditions Skid resistant, moisture and mold resistant and easy to clean WARNING: This product can expose you to chemicals including Carbon black (airborne unbound particles of respirable size) which is known to the State of California to cause cancer and