his is a vintage 1999 Mattel Hot Wheels Sol-Aire CX4 keychain, part of the Scream Machines / light-up and sound line. It features a metallic blue finish with classic Hot Wheels branding along the side.
• Model: Sol-Aire CX4 (originally designed by Larry Wood) • Manufacturer: Mattel • Year: 1999 • Type: Die-cast and plastic toy vehicle mounted on a metal keychain ring