These 45mm 97a wheels change color in the cold from white (at 72°F and above) to blue (at 55°F and below). The color change happens gradually based on the ambient temperature of the air below room tempature.
The 45mm Therm O Thanes have a chubby classic shape and measure 32.5mm wide with a 15mm treaded riding surface.
Made in USA & sold as a set of four (4).