Hot Wheels Color Shifters 2 pack: RD-03 and INVADER military army war cars - dark grey to green 2 cars - RD-03 and Invader changes from dark grey to green, and any tints in between holds color at room temp, icy water changes color, warm changes back hot wheels that change color! may not be compatible with some hot wheels sets. 1/64 scale, die cast metal and plastic parts, for ages 3 and up