Newest compound, increased grip. MAXXTRAC Silicone Rear Slicks (PAIR) for Carrera '32 Ford ( "Classic" and "Supercharged") & '41 Willys (Classic, High Performance & Supercharged) - Rounded tire sidewalls for realistic tire appearance and Part Number markings on the rear face of each tire - Super tough abrasion resistant rubber (suitable for Ninco and all other track surfaces)