This is a smooth FLAT FREE pneumatic tire with a permanent, self-healing Polyurethane rubber lining that is securely adhered to the inside of the tire casing. Tireliner heals over cuts, punctures and penetrating objects and will prevent tires from going flat if punctured or cut by objects up to 3/8" in diameter. Tireliner offers sidewall protection as well as protection for the tread face area of the tire. Tire size is 13 x 6.5-6 replaces Walker #5035-1. Made to OEM specs.