Sorry no Slot cars or chassis in this sale. They are used to show fitment and finish, you are buying just the tires. Hello, you are buying 10 full sets of New Front & Rear performance tires for AFX AURORA slot cars. Contents: 20 silicone rear tires and 20 O-ring fronts. 40 tires in all. The silicone rears are .454"mounted OD, these will lower your car and get those traction magnets working even better! The O-ring fronts are .400" mounted OD and will lower the front end and lower the guide pin in the slot. The overall Center of Gravity of the car will also be lower. Just simply adding this full performance set improves grip and handling! Direct fitment replacement for: - Afx Magnatraction - Afx Non-Magnatraction These full sets will work great on any plastic or wood track. The rear silicone tires have a nice small rolled radius to the inner and outter edge. This improves performance and helps eliminate the tripping effect of the tires in the corners. I also made the inner diameter a good bit smaller for a snug fit on the rim. No more slipping/spinning on the rim. The silicone tires composition have good balance of firmness to not sacrifice speed, but yet soft enough to not sacrifice grip. All my tires are vacuum degassed during my production process. This makes for a consistant size and composition along with a air pocket free tire. These are a great improvement over the stock AFX Aurora rubber tires. Silicone REAR Tire Specs: - .454" outside diameter measured with tire on stock .275" rear rim. - .245" inside diameter - .230" wide FRONT O-Ring Specs: - .400" outside diameter measured with O-ring on stock .275" front rim. Of course these will work on other slot cars too, check your rim specs to see if these match your needs. Any questions or concerns please feel free to ask if your uncertain or need help with your purchase. ****Free USPS 1st Class Mail shipping with tracking information **** Need silicone tires? I manufacture and sell lots of common HO scale slip on silicones. Be sure to check my other slotcar related and silicone tire sales.