This set includes six erasable highlighters in pink, orange, yellow, green, blue, and purple. The highlighters feature a rubber tip at the top that allows you to erase the highlighting easily, leaving no mess or shavings. The ink is thermo-sensitive, meaning it can be erased by rubbing and may reappear when exposed to cold temperatures below 14°F (-10°C). Made from 87% recycled materials, these highlighters are environmentally friendly. They are useful for highlighting notes and textbooks, and the erasing feature helps correct mistakes or adjust highlights without damaging the paper. However, due to the heat-sensitive ink, they are not recommended for mailing or leaving in hot environments, as the ink can reappear when exposed to cold temperatures.