卡环必须用热变色的耗材，文字用普通的同色（或色彩接近）耗材。当高温时，卡环变白色，文字就突显出来。卡环的尺寸可以根据不同的厨房用品把手定制。

The clasp must use thermochromic consumables, and the text must use ordinary consumables of the same color (or close to the same color). When exposed to high temperatures, the clasp turns white and the text stands out. The size of the snap ring can be customized according to different kitchen utensil handles.