High quality Thermometer card/stress card 1. hi-tech Heidelberg ... feeling and temperature card ,has a chip when you press it ,it can change color ,each color is stead ... :1, Material: pvc or other plastic material2, Coating: press polish high gloss or matted, special varnish for client over printing , ... back, or pantone color4,Additional options:stress chip High quality Thermometer card/stress card