This 1/2 inch rubber is commonly used to replace old rubber for large tea cart wheels. It is cut to fit and glued together with cyanoacrylate (CA) glue.
This rubber is sold by the foot (12 inches). To measure the length of material for your project, run a string around the wheel to measure the length needed, and add a bit more to allow for trimming.
For a detailed video showing trimming and installation, see the How to Replace Rubber Tires on Tea Cart Wheels video on our Fixing Furniture YouTube channel.
This is a synthetic EPDM rubber with good abrasion resistance.