1.5” hard enamel pin. Two specialty enamels; a transparent/clear hard enamel surrounds the center, and the center enamel is color changing from dark blue to a cloudy pinkish Red. The color change happens with any temperature change at 33 degrees C, or 95 degrees F. Two posts on back. Please keep in mind that because this is temperature changing enamel, colors will vary, and the enamel will have light swirls and cloudiness. I personally think this helps give it a cool cloudy effect for the remembrall. As always check our FAQ for pin grading info. AND PLEASE if you don’t get a confirmation email check your junk box. Our website sends them automatically and some email boxes put them in junk. We can NOT COMBINE ORDERS.