The sixth new Thunderjet 500 release from Round 2 (AutoWorld) is a remarkable retro look into the original Aurora cars of the same type. There are six (6) cars in the lineup which should satisfy almost every collector. A great addition at an inexpensive price. Auto World's newly improved ThunderJet Ultra/G cars feature a special neodymium traction magnet on the underside of the chassis. This additional component smoothes handling, and allows for faster speeds in the corners.