This wheels feature a two-wheeled design for enhanced power and longevity. They support up to 450 pounds per set of four and include screws for installation. Made from Thermoplastic Elastomer (TPE), they prevent ground damage and leave no marks. The price drops from $15.99 to just $9.79 with the code ''ZEA3BTA4'' at checkout. Shipping is free for Prime members or on orders over $35.