Yesterday & Today - X-Traction The X-Traction chassis is a modified version of the classic pancake design used in Auto World's ThunderJet Chassis. Increased weight and larger rear wheels provide better performance and superior handling. Underneath, and Ultra-G neodymium traction magnet adds even more track-gripping handling through the tightest curves for maximum racing excitement! FEATURES: 1:64 Scale/ HO Scale Includes 1 Ultra G Neodymium Traction Magnet Authentic Legend of the Quarter Mile Graphics Slot Cars are 100% Compatible with Tomy and AFX Sets